Add support for setting custom hosting link domain in test app

[NhienLam]

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[changeset-bot]

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Latest commit: 4c3c001

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[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v5.1

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (84b1006) and merge commit (f59ebfd).

Test Logs

• Base (84b1006): https://github.com/firebase/firebase-js-sdk/actions/runs/11522884314
• Merge (f59ebfd): https://github.com/firebase/firebase-js-sdk/actions/runs/11562239548

1. https://storage.googleapis.com/firebase-sdk-metric-reports/0DyCXi3qRH.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (84b1006) and merge commit (f59ebfd).

Test Logs

• Base (84b1006): https://github.com/firebase/firebase-js-sdk/actions/runs/11522884314
• Merge (f59ebfd): https://github.com/firebase/firebase-js-sdk/actions/runs/11562239548

1. https://storage.googleapis.com/firebase-sdk-metric-reports/YQlXr2m0Pc.html