Fix ANR in VideoPlaybackService by removing blocking loadBitmap

[Ludevv]

Sentry issues REACT-NATIVE-MY (64 events, 15 users) and REACT-NATIVE-HE (37 events, 9 users) show the main thread blocked at:

VideoPlaybackService in buildNotification at line 205 
FluentFuture$TrustedFuture in get 
AbstractFuture in get 
LockSupport in park 
Unsafe in the park 

buildNotification() calls loadBitmap(uri).get() to set the large artwork icon on the media notification. This
blocks the main thread while waiting for the bitmap to load from disk or network. If it takes too long, Android calls ANR.

The fix removes the blocking .get() call. The notification still shows title, description, playback controls, and the
small icon in the status bar — just without the large artwork image visible when the notification is expanded. He Android
13+ this code path was never used anyway, since artwork is handled automatically via MediaStyle.

[mobily]

LGTM