FcmRefreshJob: Attempt token retrieval before checking GMS status

[insaneodyssey26]

Currently, FcmRefreshJob fails immediately if isGooglePlayServicesAvailable returns a non-success code. This causes persistent "Signal was unable to register" notifications on environments like Android 16 or certain custom firmwares where GMS is actually functional enough to provide a token.
This change switches to a "try-first" approach:

1. Attempt to get the FCM token first.
2. If successful, proceed with registration (ignoring GMS status).
3. Only show the failure notification if token retrieval fails and GMS availability confirms a real error.

Fixes #14662

[greyson-signal]

So is the idea that there are devices that could give us an FCM token while simultaneously reporting Google Play Services as unavailable?

[insaneodyssey26]

So is the idea that there are devices that could give us an FCM token while simultaneously reporting Google Play Services as unavailable?

Yes... More like an Android 16 environment specific issue.