Add support in new pipeline for compose flag

- Use MediaPipelineRepository instead of specific implementation to
  allow switching based on flag
- Use relevant parts of new pipeline when flag is enabled

Flag: com.android.systemui.media_controls_in_compose
Bug: 397989775
Test: manual - play media with flag off and on
Test: MediaFilterRepositoryTest MediaCarouselInteractorTest
Change-Id: Ifdf0c0d2552f25fc30c0cd7abc99b78e70b17a14