build(oss-licenses): upgrade to Gradle 9.4 and enable full build cach…

…e support (#384)

* fix(oss-licenses): resolve implicit dependency failures on Gradle 9.x

Gradle 9.x identifies the custom LicensesCleanUpTask as a hard failure due to implicit dependency conflicts with generation tasks. Standard Gradle 'clean' (Delete) already handles the build directory idiomatically.

- Removed LicensesCleanUpTask.groovy and its corresponding test.
- Refactored EndToEndTest.kt to use a createRunner() helper with forwardOutput() and strict configuration cache validation.
- Optimized parallel test execution by isolating TestKit directories per test class.
- Updated build.gradle.kts with optimized heap settings and live test event logging.
- Added .kotlin/ to .gitignore to prevent tracking of local metadata.

Closes #356, #300, #299

* build(oss-licenses): upgrade to Gradle 9.4 and enable full build cache support

This update modernizes the build environment and ensures task outputs are correctly cached and relocatable.

- Upgraded Gradle wrapper to 9.4.0 in oss-licenses-plugin.
- Added @CacheableTask, @nested, and @PathSensitive annotations to core tasks.
- Implemented an automated relocatability test in EndToEndTest.kt.
- Verified 100% parallel throughput with isolated TestKit directories.

Closes #356

* test(oss-licenses): modernize test matrix to follow Stable/RC/Alpha tracks

Updated the E2E test matrix to cover the latest AGP tracks:
- Stable: AGP 9.0.1
- RC: AGP 9.1.0-rc01
- Alpha: AGP 9.2.0-alpha02

Also updated Kotlin version expectation logic to correctly handle AGP 9.1 and 9.2.

* build(oss-licenses): increase Gradle daemon memory

Increased Xmx to 2048m and MaxMetaspaceSize to 1024m to prevent daemon resets during intensive parallel E2E tests.

* test(oss-licenses): ensure robust relocatability verification

Refactored testRelocatability to use the setupProject helper, ensuring project structure consistency across cloned directories.

* test(oss-licenses): ensure bulletproof relocatability verification

Modified populate() in testRelocatability() to explicitly skip build/ and .gradle/ directories during copying.
This guarantees that the relocated projects start from a pristine state, correctly verifying cache relocation instead of hitting UP-TO-DATE due to accidental output duplication.

Bumpd oss licenses plugin version to 0.10.10. (#359)

Co-authored-by: Arco <arcoxu@google.com>

Bumpd oss licenses plugin version to 0.10.9. (#341)

Co-authored-by: Arco Xu <arcoxu@google.com>

Bump oss-licenses-plugin version (#326)

bump version for m168 release

Merge pull request #242 from google/config_cache

Add call to notCompatibleWithConfigurationCache to LicensesTask

Merge pull request #216 from google/agp

Switch to using app dependency report from Android Gradle Plugin.

Merge pull request #173 from google/oss-licenses-issue-172

Add oss-licenses-plugin support for dependency cycles in projects

Merge pull request #169 from caller9/gradle_7_compat

Make oss-licenses-plugin compatible with Gradle 7

Merge pull request #128 from google/missing_dependencies

Missing dependencies