Migrate Firebase Functions to V2 API and Update Dependencies

[tharropoulos]

Change Summary

What is this?

This change modernizes our Firebase Functions implementation by upgrading to the V2 API. We're also updating our dependencies to their latest stable versions to ensure we're using the most secure and feature-rich versions available.
This comes as a response to users wanting to migrate to the V2 API to make use of all the new features that it provides.

Changes

Code Changes:

1. In functions/src/indexOnWrite.js:

   • Migrated from functions.firestore.document().onWrite() to onDocumentWritten() V2 API
   • Replaced functions.logger with granular imports from firebase-functions/logger
   • Simplified code structure and improved error handling patterns

2. In functions/src/backfill.js:

   • Updated function handler to use V2 onDocumentWritten syntax
   • Migrated logging to use destructured imports (info, error) from firebase-functions/logger
   • Improved code formatting and readability

3. In functions/src/index.js:

   • Added dotenv configuration for better environment variable management
   • Maintained existing exports structure for backward compatibility

Dependency Updates:

1. Major Version Updates:

   • firebase-admin: 12.2.0 → 13.0.1
   • firebase-functions: 5.0.1 → 6.1.1

2. Added Dependencies:

   • dotenv: ^16.4.7 for improved environment variable handling

3. Removed Dependencies:

   • firebase-functions-test: Removed as it's not needed in the current test setup

This update maintains all existing functionality while modernizing the codebase.

PR Checklist

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