Introduce BackupUtils#setBackupTransport for current user

This CL adds a new utility method setBackupTransport(String transport)
to BackupUtils. This method simplifies setting the backup transport
by automatically targeting the current user, invoking
setBackupTransportForUser(transport, getCurrentUserId()).

Bug: 417348387
Bug: 410032204
Test: atest RestoreSessionHostSideTest
Change-Id: I1b08f1cff21064b14fdf74eb2a5ea3773ae77837
1 file changed