chore: merge release branch back into main

[hsubox76]

Merge release back to main after 12.16.0 release. Need to make a PR because "Github Actions Scan" workflow is required. Sorry for the spam.

[changeset-bot]

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Latest commit: 51aca87

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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: v17.0

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[gemini-code-assist]

Code Review

This pull request updates the versions and dependencies of several Firebase packages, notably bumping @firebase/app to 0.15.1, @firebase/app-compat to 0.5.15, @firebase/remote-config to 0.9.0, @firebase/remote-config-compat to 0.2.27, and the main firebase package to 12.16.0. These updates introduce support for realtime Remote Config rollouts. Changelogs have been updated accordingly, and a changeset file has been removed. There are no review comments, and I have no feedback to provide.