[PM Fixer] Fix gradle v9.8.0-RC2 compatibility: remove bundled 'idea' plugin removed in Gradle 9.x

[agrasth]

Summary

All Gradle integration tests failed when run with Gradle v9.8.0-RC2 (and any Gradle 9.x release). The root cause is that apply plugin: 'idea' appears in two test fixture build scripts:

• testdata/gradle/gradleproject/build.gradle
• testdata/gradle/projectwithplugin/build.gradle

Gradle's IDEA IDE plugin (org.gradle.plugins.ide.idea.IdeaPlugin) was removed from Gradle's bundled distribution in Gradle 9.0. Because apply plugin statements are evaluated during the configuration phase — before any task runs — this produces an immediate fatal error on every build invocation:

Plugin with id 'idea' not found.

This caused steps.run_tests.outcome = failure for every test that exercises gradleproject or projectwithplugin, including TestGradleBuildWithServerID, TestGradleBuildWithServerIDAndDetailedSummary, TestGradleWithDeploymentView, TestGradleBuildConditionalUpload, TestGradleBuildWithFlexPackFallback, TestGradleBuildPublishWithLocalGitVcsProps, and TestGradleBuildWithServerIDWithUsesPlugin.

Fix

Remove the two apply plugin: 'idea' lines. This is a test-fixture-only change — it does not affect product behavior in any way.

The IDEA plugin generates IntelliJ IDEA project files (.idea/, .iml) for developer ergonomics. None of the integration tests depend on IDE project-file generation; they test build, compile, artifact publish, and build-info collection. The plugin was never exercised by the test suite — it was just inherited from an old project template.

Removing it is safe for all Gradle versions (5.x, 6.x, 7.x, 8.x, 9.x): the plugin was optional in older versions and non-existent in newer ones.

Compatibility impact

No exported Go symbols were changed. This change touches only Groovy build script test fixtures in testdata/. Existing supported Gradle versions (5.6.4, 8.3) are unaffected — removing apply plugin: 'idea' has no effect on older Gradle because the plugin was purely additive.

Test plan

• go build ./...: Not applicable — the changed files are Groovy build scripts, not Go source. Go is also not installed in this environment.
• gofmt -l .: Not applicable for the same reason.
• go vet ./...: Not applicable.
• Live PM integration test: Cannot be run in this environment (no live Artifactory). The fix removes a configuration-time plugin lookup failure that would cause every Gradle invocation to abort before executing any task.

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Opened automatically by PM Compat Fixer investigating gradle v9.8.0-RC2.

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