hotfix/cp-11369-android-fcm-token-retrieval-fails-on-latest-firebase-flutter

[unnaticleverpush]

Fix FCM token retrieval for latest Firebase and add safe fallback handling

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Summary by cubic

Fixes Android FCM token retrieval on the latest Firebase by calling FirebaseMessaging.getToken() first and only falling back to FirebaseInstanceId if the class exists. Returns null when neither path is available to avoid crashes. Addresses Linear CP-11369.

• Bug Fixes
  • Invoke FirebaseMessaging.getInstance().getToken() via reflection and Tasks.await(...).
  • Add isFirebaseInstanceIdAvailable() check; only use FirebaseInstanceId.getToken(...) when present; otherwise warn and return null.
  • Improve logging by including caught exceptions and explicit fallback failure messages.
  • Simplify reflection and rethrow specific exceptions in getTokenWithClassFirebaseMessaging().

^{Written for commit b1f2d7c. Summary will update on new commits.}

[cubic-dev-ai]

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