Implement GMavenService

[daymxn]

Per b/392134866,

This implements a centralized interface for communicating with GMaven called GMavenService. This service implements the gradle build-service interface to provide proper parallel access, and keeps local ConcurrentHashMap instances to cache responses.

Cached responses are on a per-build basis, to avoid improper caching of dynamic data. That is, given any build- all tasks that utilize GMavenService will share the responses from GMaven; even within a parallel environment. But if the tasks are considered out-of-date and are ran again, then new requests will be made to the GMaven backend.

Tests and documentation are provided for everything added as well.

Note that while this PR implements GMavenService- it does not refactor the existing GMavenHelper and RepositoryClient usages to use it. That will occur in subsequent PRs, as to avoid polluting this PR. Furthermore, while there are no tests for PomElement directly- in a future PR that includes tests for bom generation, PomElement will be tested as a by-product.

This PR also fixes the following:

• b/392135224 -> Implement centralized pom datamodel

[github-actions]

Release note changes

No release note changes were detected. If you made changes that should be
present in the next release, ensure you've added an entry in the appropriate
CHANGELOG.md file(s).

[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_responses.sh should be updated to clone the latest version of the responses: v5.3

[github-actions]

plugins test results

49 tests   49 ✅  3m 9s ⏱️
 9 suites   0 💤
 9 files     0 ❌

Results for commit 030c1a4.

[github-actions]

Test Results

 1 034 files  ±0   1 034 suites  ±0   34m 23s ⏱️ +27s
 5 888 tests ±0   5 866 ✅ ±0  22 💤 ±0  0 ❌ ±0 
11 839 runs  ±0  11 795 ✅ ±0  44 💤 ±0  0 ❌ ±0 

Results for commit 030c1a4. ± Comparison against base commit 0ce193f.

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (0ce193f) and merge commit (f955f79).

Test Logs

• Base (0ce193f): https://github.com/firebase/firebase-android-sdk/actions/runs/12954915649
• Merge (f955f79): https://github.com/firebase/firebase-android-sdk/actions/runs/12956716780

1. https://storage.googleapis.com/firebase-sdk-metric-reports/tI5lRAnA4m.html

[google-oss-bot]

Coverage Report ¹

Affected Products

• firebase-database

  Overall coverage changed from 50.16% (0ce193f) to 50.21% (f955f79) by +0.04%.

  Filename	Base (0ce193f)	Merge (f955f79)	Diff
  ChildChangeAccumulator.java	83.33%	96.67%	+13.33%

• firebase-messaging

  Overall coverage changed from 84.23% (0ce193f) to 84.04% (f955f79) by -0.19%.

  Filename	Base (0ce193f)	Merge (f955f79)	Diff
  FirebaseMessaging.java	76.80%	76.00%	-0.80%
  Metadata.java	41.27%	36.51%	-4.76%

• firebase-firestore

  Filename	Base (0ce193f)	Merge (f955f79)	Diff
  DeleteMutation.java	95.24%	90.48%	-4.76%
  PatchMutation.java	98.39%	100.00%	+1.61%

Test Logs

• Base (0ce193f): https://github.com/firebase/firebase-android-sdk/actions/runs/12954915649
• Merge (f955f79): https://github.com/firebase/firebase-android-sdk/actions/runs/12956716780

1. https://storage.googleapis.com/firebase-sdk-metric-reports/LbcSd7M01n.html