Remove recommendation code from media pipeline

This includes
- onSmartspaceMediaDataLoaded/Removed callback methods
- params in onMediaDataLoaded that were only relevant with recommendations
- SmartspaceMediaData et al
- And renaming has*MediaOrRecommendation methods

Bug: 382680767
Flag: EXEMPT refactor - unused code
Test: play media with and without scene container flag enabled
Test: atest SystemUITests:com.android.systemui.media.controls
Test: atest SystemUITests:com.android.systemui.qs
Change-Id: I7c0107cb8941876840467a1c9f9e526229ec7e29