This change adds the ability to update the error code of the PlaybackStateCompat in
cases we need this for backwards compatibility. It is applied in the least
intrusive way because normally, return values of a service method should not change
the state of the `PlaybackStateCompat`, just because it has nothing to do with the
playback state but rather with the state of the `MediaLibrarySession`.
For this reason only the error code `RESULT_ERROR_SESSION_AUTHENTICATION_EXPIRED`
is taken into account while all other error codes are not mapped to the
`PlaybackStateCompat'.
PiperOrigin-RevId: 438038852
MediaNotificationHandler tries to connect session in the same
process, so tests should be aware MediaControllers from the
MediaNotificationHandler.
PiperOrigin-RevId: 422330424
