Realtime RC test cases

[Samruddhi90]

This PR is a follow-up to #9206

This PR includes all the unit tests for the real-time Remote Config feature.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6ceee95

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (f583f8e) and merge commit (cb4f463).

Test Logs

• Base (f583f8e): https://github.com/firebase/firebase-js-sdk/actions/runs/17099512840
• Merge (cb4f463): https://github.com/firebase/firebase-js-sdk/actions/runs/17100027590

1. https://storage.googleapis.com/firebase-sdk-metric-reports/oRTts7Xxtl.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (f583f8e) and merge commit (cb4f463).

Test Logs

• Base (f583f8e): https://github.com/firebase/firebase-js-sdk/actions/runs/17099512840
• Merge (cb4f463): https://github.com/firebase/firebase-js-sdk/actions/runs/17100027590

1. https://storage.googleapis.com/firebase-sdk-metric-reports/eYZNS01Iqn.html