Add Vertex and DataConnect E2E smoke tests

[hsubox76]

Add post-npm publish smoke tests for VertexAI and DataConnect. Also added the same cases to the sample apps.

[changeset-bot]

⚠️ No Changeset found

Latest commit: b3b51f0

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (c3266f8) and merge commit (6b90cd4).

Test Logs

• Base (c3266f8): https://github.com/firebase/firebase-js-sdk/actions/runs/13442465307
• Merge (6b90cd4): https://github.com/firebase/firebase-js-sdk/actions/runs/13445866958

1. https://storage.googleapis.com/firebase-sdk-metric-reports/GGJ9loLD59.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (c3266f8) and merge commit (6b90cd4).

Test Logs

• Base (c3266f8): https://github.com/firebase/firebase-js-sdk/actions/runs/13442465307
• Merge (6b90cd4): https://github.com/firebase/firebase-js-sdk/actions/runs/13445866958

1. https://storage.googleapis.com/firebase-sdk-metric-reports/63TDE9Z8xH.html