[BUG] thirdPartyAudit task fails when copying duplicate files

[finnegancarroll]

Describe the bug

Plugin dependencies which use identical file names for their metadata will cause the thirdPartyAudit task to fail for the plugin with the following error:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':plugins:transport-grpc:thirdPartyAudit'.
> Could not copy zip entry '/Users/carrofin/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/33.2.1-jre/818e780da2c66c63bbb6480fef1f3855eeafa3e4/guava-33.2.1-jre.jar!META-INF/LICENSE' to '/Users/carrofin/fdev/tmp/OpenSearch/plugins/transport-grpc/build/precommit/thirdPartyAudit/thirdPartyAudit/META-INF/LICENSE'.
   > /Users/carrofin/fdev/tmp/OpenSearch/plugins/transport-grpc/build/precommit/thirdPartyAudit/thirdPartyAudit/META-INF/LICENSE (Is a directory)

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Get more help at https://help.gradle.org.

In this case dependency 1 attempts to write a LICENSE file to plugins/<my-plugin>/build/precommit/thirdPartyAudit/thirdPartyAudit/META-INF while dependency 2 populates a LICENSE directory at the same location.

Related component

Build

To Reproduce

Branch with minimal example: https://github.com/finnegancarroll/OpenSearch/tree/dbg-plugin-3prtyaud

Reproduce with:

./gradlew precommit -x :plugins:transport-grpc:testingConventions

Expected behavior

thirdPartyAudit task should handle this collision gracefully and pass.
Proposed solution - Create sub directories for each dependency: #16844