Revert "KT-60954 [Analysis API] Unwrap variable assignments in `KtFirReferenceShortener`"

This reverts commit ab8726cff1c2a9a57f5c007f04353923ca7e8a1c.
diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirReferenceShortener.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirReferenceShortener.kt
index cfb8876..13d2fe6 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirReferenceShortener.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirReferenceShortener.kt
@@ -973,7 +973,7 @@
         val scopes = shorteningContext.findScopesAtPosition(qualifiedProperty, getNamesToImport(), towerContextProvider) ?: return
         val availableCallables = shorteningContext.findPropertiesInScopes(scopes, callableSymbol.name)
 
-        val firPropertyAccess = qualifiedProperty.getCorrespondingPropertyAccessExpression() ?: return
+        val firPropertyAccess = qualifiedProperty.getOrBuildFir(firResolveSession) as? FirQualifiedAccessExpression ?: return
 
         // if explicit receiver is a property access or a function call, we cannot shorten it
         if (firPropertyAccess.explicitReceiver !is FirResolvedQualifier) return
@@ -992,15 +992,6 @@
         )
     }
 
-    private fun KtDotQualifiedExpression.getCorrespondingPropertyAccessExpression(): FirPropertyAccessExpression? {
-        val accessExpression = when (val fir = getOrBuildFir(firResolveSession)) {
-            is FirVariableAssignment -> fir.unwrapLValue()
-            else -> fir
-        }
-
-        return accessExpression as? FirPropertyAccessExpression
-    }
-
     private fun processFunctionCall(functionCall: FirFunctionCall) {
         if (!canBePossibleToDropReceiver(functionCall)) return
 
diff --git a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java
index 19d6551..154cb84 100644
--- a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java
+++ b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java
@@ -436,24 +436,6 @@
         runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variable2.kt");
     }
 
-    @Test
-    @TestMetadata("variableAssignment.kt")
-    public void testVariableAssignment() throws Exception {
-        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.kt");
-    }
-
-    @Test
-    @TestMetadata("variableAssignment_plusAssignOperator.kt")
-    public void testVariableAssignment_plusAssignOperator() throws Exception {
-        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.kt");
-    }
-
-    @Test
-    @TestMetadata("variableAssignment_plusOperator.kt")
-    public void testVariableAssignment_plusOperator() throws Exception {
-        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.kt");
-    }
-
     @Nested
     @TestMetadata("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/nestedClasses")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java b/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java
index dceb4b4..bd89f36 100644
--- a/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java
+++ b/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java
@@ -436,24 +436,6 @@
         runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variable2.kt");
     }
 
-    @Test
-    @TestMetadata("variableAssignment.kt")
-    public void testVariableAssignment() throws Exception {
-        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.kt");
-    }
-
-    @Test
-    @TestMetadata("variableAssignment_plusAssignOperator.kt")
-    public void testVariableAssignment_plusAssignOperator() throws Exception {
-        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.kt");
-    }
-
-    @Test
-    @TestMetadata("variableAssignment_plusOperator.kt")
-    public void testVariableAssignment_plusOperator() throws Exception {
-        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.kt");
-    }
-
     @Nested
     @TestMetadata("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/nestedClasses")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.kt b/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.kt
deleted file mode 100644
index 30f46a4..0000000
--- a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.kt
+++ /dev/null
@@ -1,11 +0,0 @@
-// FILE: main.kt
-package test
-
-fun usage() {
-    <expr>dependency.foo = 20</expr>
-}
-
-// FILE: dependency.kt
-package dependency
-
-var foo: Int = 10
\ No newline at end of file
diff --git a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.txt b/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.txt
deleted file mode 100644
index 3bdee8c..0000000
--- a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-Before shortening: dependency.foo = 20
-with DO_NOT_SHORTEN:
-with SHORTEN_IF_ALREADY_IMPORTED:
-with SHORTEN_AND_IMPORT:
-[qualifier] dependency.foo
-with SHORTEN_AND_STAR_IMPORT:
-[qualifier] dependency.foo
diff --git a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.kt b/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.kt
deleted file mode 100644
index f61b08e..0000000
--- a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// FILE: main.kt
-package test
-
-fun usage() {
-    <expr>dependency.foo += 20</expr>
-}
-
-// FILE: dependency.kt
-package dependency
-
-val foo: Foo = Foo()
-
-class Foo {
-    operator fun plusAssign(i: Int) {}
-}
\ No newline at end of file
diff --git a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.txt b/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.txt
deleted file mode 100644
index b0e2074..0000000
--- a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusAssignOperator.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-Before shortening: dependency.foo += 20
-with DO_NOT_SHORTEN:
-with SHORTEN_IF_ALREADY_IMPORTED:
-with SHORTEN_AND_IMPORT:
-[qualifier] dependency.foo
-with SHORTEN_AND_STAR_IMPORT:
-[qualifier] dependency.foo
diff --git a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.kt b/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.kt
deleted file mode 100644
index e4c3ee9..0000000
--- a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-// FILE: main.kt
-package test
-
-fun usage() {
-    <expr>dependency.foo += 20</expr>
-}
-
-// FILE: dependency.kt
-package dependency
-
-var foo: Foo = Foo()
-
-class Foo {
-    operator fun plus(i: Int): Foo = this
-}
\ No newline at end of file
diff --git a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.txt b/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.txt
deleted file mode 100644
index b0e2074..0000000
--- a/analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-Before shortening: dependency.foo += 20
-with DO_NOT_SHORTEN:
-with SHORTEN_IF_ALREADY_IMPORTED:
-with SHORTEN_AND_IMPORT:
-[qualifier] dependency.foo
-with SHORTEN_AND_STAR_IMPORT:
-[qualifier] dependency.foo