chore(firestore-counter): update to node22

[HassanBahati]

Description

Update the firestore-counter extension to use Node.js 22 for all Cloud Functions, bump its patch version, and verify the functions package installs, audits, and builds.

Related Issues:

Part of Fixes #2659
Fixes #2663

Changes Made

• Extension manifest (firestore-counter/extension.yaml)

  • Updated all Cloud Functions runtimes from nodejs20 to nodejs22:
    • controllerCore
    • onWrite
    • worker
  • Bumped extension version from 0.2.13 to 0.2.14.

• Changelog (firestore-counter/CHANGELOG.md)

  • Added a new entry for 0.2.14:
    • chore: update Cloud Functions runtime to Node.js 22.

• Functions package (firestore-counter/functions)

  • Ran npm install to ensure dependencies resolve correctly.
  • Ran npm audit to collect current vulnerability status.
  • Ran npm run build to confirm the TypeScript sources compile successfully.

Testing Evidence

Tests Run

• Unit tests
• Integration tests
• Manual testing (install / audit / build)