Simplify media control view model

- Merge MediaCommonViewModel into MediaControlViewModel
- Remove unused field immediatelyUpdateUi

Bug: 382680767
Test: play media with and without scene container flag enabled
Test: atest MediaCarouselControllerTest
Test: atest MediaDiffUtilTest
Test: atest MediaFilterRepositoryTest
Flag: EXEMPT refactor
Change-Id: If8bc5706a64a357493536b7b466d4117c4a56512