Add listening to the IVolumeController for the volume changes in AudioRepository.

Flag: com.android.systemui.use_volume_controller
Test: manual on the phone. change volume using both: volume panel and volume dialog
Test: atest AudioRepositoryTest
Test: atest VolumeDialogControllerImplTestKt
Bug: 349348461
Change-Id: Ic8d9095808f890b21c4de3fd4cdd6db131d3954d