VertexAI: use updated set of mock responses

[tanzimfh]

The set of mock responses were updated to reduce some more duplication: FirebaseExtended/vertexai-sdk-test-data#12

This updates the test code to use the updated version.

[changeset-bot]

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Latest commit: b29f041

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (e6b8525) and merge commit (86b9001).

Test Logs

• Base (e6b8525): https://github.com/firebase/firebase-js-sdk/actions/runs/10353009232
• Merge (86b9001): https://github.com/firebase/firebase-js-sdk/actions/runs/10359162763

1. https://storage.googleapis.com/firebase-sdk-metric-reports/5I7muRvUfS.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (e6b8525) and merge commit (86b9001).

Test Logs

• Base (e6b8525): https://github.com/firebase/firebase-js-sdk/actions/runs/10353009232
• Merge (86b9001): https://github.com/firebase/firebase-js-sdk/actions/runs/10359162763

1. https://storage.googleapis.com/firebase-sdk-metric-reports/yq8mbm1lQG.html