VertexAI: add support for mock responses versioning system

[tanzimfh]

This adds a new script that clones the latest minor version within a hard-coded major version of the mock responses.

It also adds a CI job that leaves a comment on the PR if the script is cloning an outdated major version.

[changeset-bot]

⚠️ No Changeset found

Latest commit: dadea09

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions]

Changeset File Check ⚠️

• Changeset formatting error in following file:%0A %0A Some packages have been changed but no changesets were found. Run `changeset add` to resolve this error.%0A If this change doesn't need a release, run `changeset add --empty`.%0A %0A

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (52f8deb) and merge commit (f4e4147).

Test Logs

• Base (52f8deb): https://github.com/firebase/firebase-js-sdk/actions/runs/9782894009
• Merge (f4e4147): https://github.com/firebase/firebase-js-sdk/actions/runs/9847586954

1. https://storage.googleapis.com/firebase-sdk-metric-reports/bIPr5Jp5N8.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (52f8deb) and merge commit (f4e4147).

Test Logs

• Base (52f8deb): https://github.com/firebase/firebase-js-sdk/actions/runs/9782894009
• Merge (f4e4147): https://github.com/firebase/firebase-js-sdk/actions/runs/9847586954

1. https://storage.googleapis.com/firebase-sdk-metric-reports/vPYed2ijVp.html