chore: update system.sh with firestore creds.json path

[chalmerlowe]

This is a blocker for the migration of firestore to this repo. Firestore needs access to a project that has firestore native DBs, which precise-truck-742 does not explicitly have.

Fixes failing tests in #15590 🦕

[gemini-code-assist]

Summary of Changes

Hello @chalmerlowe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical blocker for the migration of Firestore by configuring the necessary application credentials within the Kokoro build environment. This change ensures that Firestore-related tests, which were previously failing due to missing credentials, can now execute successfully, paving the way for further integration.

Highlights

• Firestore Credentials Setup: Added the FIRESTORE_APPLICATION_CREDENTIALS environment variable to .kokoro/system.sh, pointing to firebase-credentials.json.

Changelog

• .kokoro/system.sh
  • Added an environment variable for Firestore application credentials.

Activity

• No specific review comments or activity have been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

The pull request introduces a new environment variable FIRESTORE_APPLICATION_CREDENTIALS to point to the firebase-credentials.json file. This change is necessary for Firestore migration and fixes failing tests. The change is straightforward and correctly implemented.