Add missing experimentalApi annotations to vertex tests

[rlazo]

This reduces the noise we are seeing in our builds

[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: v5.2

[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add the 'no-changelog' label to the PR to silence this warning.)

Generated by 🚫 Danger

[google-oss-bot]

Coverage Report ¹

Affected Products

No changes between base commit (bae6706) and merge commit (3f30ba0).

Test Logs

• Merge (3f30ba0): https://github.com/firebase/firebase-android-sdk/actions/runs/12088130470

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

[github-actions]

Test Results

 20 files  ±  0   20 suites  ±0   12s ⏱️ -12s
113 tests + 90  113 ✅ + 90  0 💤 ±0  0 ❌ ±0 
226 runs  +158  226 ✅ +158  0 💤 ±0  0 ❌ ±0 

Results for commit 289687a. ± Comparison against base commit bae6706.

This pull request removes 23 and adds 113 tests. Note that renamed tests count towards both.

com.google.firebase.functions.AppCheckLimitedUseTest ‑ FirebaseFunctions#getHttpsCallable should build callable with FAC settings (when false)
com.google.firebase.functions.AppCheckLimitedUseTest ‑ FirebaseFunctions#getHttpsCallable should build callable with FAC settings (when true)
com.google.firebase.functions.AppCheckLimitedUseTest ‑ FirebaseFunctions#getHttpsCallable should not use limited-use tokens by default
com.google.firebase.functions.AppCheckLimitedUseTest ‑ FirebaseFunctions#getHttpsCallableFromUrl callable with FAC settings (when false)
com.google.firebase.functions.AppCheckLimitedUseTest ‑ FirebaseFunctions#getHttpsCallableFromUrl callable with FAC settings (when true)
com.google.firebase.functions.AppCheckLimitedUseTest ‑ FirebaseFunctions#getHttpsCallableFromUrl should not use limited-use tokens by default
com.google.firebase.functions.FunctionsRegistrarTest ‑ getComponents_publishesLibVersionComponent
com.google.firebase.functions.FunctionsTests ‑ Firebase#functions should delegate to FirebaseFunctions#getInstance(FirebaseApp, region)
com.google.firebase.functions.FunctionsTests ‑ Firebase#functions should delegate to FirebaseFunctions#getInstance(region)
com.google.firebase.functions.FunctionsTests ‑ FirebaseApp#functions should delegate to FirebaseFunctions#getInstance(FirebaseApp)
…

com.google.firebase.vertexai.GenerativeModelTesting ‑ exception thrown when using invalid location
com.google.firebase.vertexai.GenerativeModelTesting ‑ system calling in request
com.google.firebase.vertexai.SchemaTests ‑ basic schema declaration
com.google.firebase.vertexai.SchemaTests ‑ full schema declaration
com.google.firebase.vertexai.StreamingSnapshotTests ‑ citation parsed correctly
com.google.firebase.vertexai.StreamingSnapshotTests ‑ empty content
com.google.firebase.vertexai.StreamingSnapshotTests ‑ http errors
com.google.firebase.vertexai.StreamingSnapshotTests ‑ image rejected
com.google.firebase.vertexai.StreamingSnapshotTests ‑ invalid api key
com.google.firebase.vertexai.StreamingSnapshotTests ‑ invalid json
…

♻️ This comment has been updated with latest results.

[google-oss-bot]

Size Report ¹

Affected Products

• base

  Type	Base (bae6706)	Merge (3f30ba0)	Diff
  apk (aggressive)	?	8.80 kB	? (?)
  apk (release)	?	9.77 kB	? (?)

• firebase-vertexai

  Type	Base (bae6706)	Merge (3f30ba0)	Diff
  aar	?	477 kB	? (?)
  apk (aggressive)	?	1.14 MB	? (?)
  apk (release)	?	9.29 MB	? (?)

Test Logs

• Merge (3f30ba0): https://github.com/firebase/firebase-android-sdk/actions/runs/12088130470

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