Bring badgeOnly property to Android notifs

Summary: This differential solves urgent issue: https://linear.app/comm/issue/ENG-8620/badge-only-notifs-are-broken-on-android-in-production. No need to change on client. If the Andorid client sees badgeOnly:'1' they will return early without displaying notification.

Test Plan:

1. Build Android app.
2. Mark a thread as badge only in settings.
3. Send notif from this thread. Ensure the notif is delivered.
4. Apply this diff.
5. Send notif from this thread. Ensure that the notifs is not delivered.

Reviewers: tomek

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D12634