Revert "[Build] Switch Gradle plugins compilation to BTA"

This reverts commit 74b9b932ee940f2643f85204786dd2bcba1bd82f.
diff --git a/build.gradle.kts b/build.gradle.kts
index 68739ce..453231e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -9,12 +9,10 @@
     // see also configureCompilerClasspath@
     val bootstrapCompilerClasspath by configurations.creating
     val bootstrapBuildToolsApiClasspath by configurations.creating
-    val gradlePluginsBuildToolsApiClasspath by configurations.creating
 
     dependencies {
         bootstrapCompilerClasspath(kotlin("compiler-embeddable", bootstrapKotlinVersion))
         bootstrapBuildToolsApiClasspath(kotlin("build-tools-impl", bootstrapKotlinVersion))
-        gradlePluginsBuildToolsApiClasspath(kotlin("build-tools-impl", libs.versions.kotlin.`for`.gradle.plugins.compilation.get()))
 
         classpath("org.jetbrains.kotlin:kotlin-build-gradle-plugin:${kotlinBuildProperties.buildGradlePluginVersion}")
     }
diff --git a/repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/GradleCommon.kt b/repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/GradleCommon.kt
index 13da020..4cb6d6a 100644
--- a/repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/GradleCommon.kt
+++ b/repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/GradleCommon.kt
@@ -584,14 +584,6 @@
             )
         }
     }
-    project.extra["kotlin.compiler.runViaBuildToolsApi"] = true
-    afterEvaluate {
-        val gradlePluginsBuildToolsApiClasspath by rootProject.buildscript.configurations
-        configurations.findByName("kotlinBuildToolsApiClasspath")?.let {
-            it.dependencies.clear()
-            dependencies.add(it.name, files(gradlePluginsBuildToolsApiClasspath))
-        }
-    }
 }
 
 // Will allow combining outputs of multiple SourceSets