refactor: remove gazelle plugin as dev dependency (#3436)

Remove the gazelle pluging as a dev-time dependency of rules_python
itself.

This is to avoid gazelle-related build issues that affect the main
build.

The gazelle code paths in tests/integration are removed because they
were just
test runners being defined, but weren't actually used with any tests.

BUILD.bazel

diff --git a/BUILD.bazel b/BUILD.bazel
index 5e85c27..aa2642d 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -45,7 +45,6 @@
         "version.bzl",
         "//python:distribution",
         "//tools:distribution",
-        "@rules_python_gazelle_plugin//:distribution",
     ],
     visibility = [
         "//:__subpackages__",

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index 6e9b725..b909124 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -227,8 +227,6 @@
 # Extra gazelle plugin deps so that WORKSPACE.bzlmod can continue including it for e2e tests.
 # We use `WORKSPACE.bzlmod` because it is impossible to have dev-only local overrides.
 bazel_dep(name = "rules_go", version = "0.41.0", dev_dependency = True, repo_name = "io_bazel_rules_go")
-bazel_dep(name = "rules_python_gazelle_plugin", version = "0", dev_dependency = True)
-bazel_dep(name = "gazelle", version = "0.40.0", dev_dependency = True, repo_name = "bazel_gazelle")
 
 internal_dev_deps = use_extension(
     "//python/private:internal_dev_deps.bzl",
@@ -258,13 +256,6 @@
     setting = "//tests/multi_pypi:external_deps_name",
 )
 
-# Add gazelle plugin so that we can run the gazelle example as an e2e integration
-# test and include the distribution files.
-local_path_override(
-    module_name = "rules_python_gazelle_plugin",
-    path = "gazelle",
-)
-
 local_path_override(
     module_name = "other",
     path = "tests/modules/other",

tests/integration/BUILD.bazel

diff --git a/tests/integration/BUILD.bazel b/tests/integration/BUILD.bazel
index 6733129..f0f58da 100644
--- a/tests/integration/BUILD.bazel
+++ b/tests/integration/BUILD.bazel
@@ -23,14 +23,6 @@
     "--enable_workspace",
 ]
 
-_WORKSPACE_GAZELLE_PLUGIN_FLAGS = [
-    "--override_repository=rules_python_gazelle_plugin=../../../rules_python_gazelle_plugin",
-]
-
-_GAZELLE_PLUGIN_FLAGS = [
-    "--override_module=rules_python_gazelle_plugin=../../../rules_python_gazelle_plugin",
-]
-
 default_test_runner(
     name = "workspace_test_runner",
     bazel_cmds = [
@@ -41,30 +33,10 @@
 )
 
 default_test_runner(
-    name = "workspace_test_runner_gazelle_plugin",
-    bazel_cmds = [
-        "info {}".format(" ".join(_WORKSPACE_FLAGS + _WORKSPACE_GAZELLE_PLUGIN_FLAGS)),
-        "test {} //...".format(" ".join(_WORKSPACE_FLAGS + _WORKSPACE_GAZELLE_PLUGIN_FLAGS)),
-    ],
-    visibility = ["//visibility:public"],
-)
-
-default_test_runner(
     name = "test_runner",
     visibility = ["//visibility:public"],
 )
 
-default_test_runner(
-    name = "test_runner_gazelle_plugin",
-    bazel_cmds = [
-        "info {}".format(" ".join(_GAZELLE_PLUGIN_FLAGS)),
-        "test {} //...".format(" ".join(_GAZELLE_PLUGIN_FLAGS)),
-    ],
-    visibility = ["//visibility:public"],
-)
-
-# TODO: add compile_pip_requirements_test_from_external_repo
-
 rules_python_integration_test(
     name = "compile_pip_requirements_test",
 )

tests/integration/integration_test.bzl

diff --git a/tests/integration/integration_test.bzl b/tests/integration/integration_test.bzl
index 90cc4a3..771976d 100644
--- a/tests/integration/integration_test.bzl
+++ b/tests/integration/integration_test.bzl
@@ -21,7 +21,7 @@
 )
 load("//python:py_test.bzl", "py_test")
 
-def _test_runner(*, name, bazel_version, py_main, bzlmod, gazelle_plugin):
+def _test_runner(*, name, bazel_version, py_main, bzlmod):
     if py_main:
         test_runner = "{}_bazel_{}_py_runner".format(name, bazel_version)
         py_test(
@@ -35,12 +35,8 @@
         )
         return test_runner
 
-    if bzlmod and gazelle_plugin:
-        return "//tests/integration:test_runner_gazelle_plugin"
-    elif bzlmod:
+    if bzlmod:
         return "//tests/integration:test_runner"
-    elif gazelle_plugin:
-        return "//tests/integration:workspace_test_runner_gazelle_plugin"
     else:
         return "//tests/integration:workspace_test_runner"
 
@@ -48,7 +44,6 @@
         name,
         workspace_path = None,
         bzlmod = True,
-        gazelle_plugin = False,
         tags = None,
         py_main = None,
         bazel_versions = None,
@@ -61,7 +56,6 @@
             `_test` suffix.
         bzlmod: bool, default True. If true, run with bzlmod enabled, otherwise
             disable bzlmod.
-        gazelle_plugin: Whether the test uses the gazelle plugin.
         tags: Test tags.
         py_main: Optional `.py` file to run tests using. When specified, a
             python based test runner is used, and this source file is the main
@@ -98,7 +92,6 @@
             bazel_version = bazel_version,
             py_main = py_main,
             bzlmod = bzlmod,
-            gazelle_plugin = gazelle_plugin,
         )
         bazel_integration_test(
             name = "{}_bazel_{}".format(name, bazel_version),