Refactor: Update the way tintAmount is propagated to TTV

- Propagate the tintAmount using the Views instead of using a Flow.

This was done to minimize the usage of Flows to propagate animations
and progress through Views. It should improve the overall performance
of UI updates

Some stats about the number of collections:
- Entering Overview: ~4 collections
- Displaying Scrim: ~32 collections
- Hiding Scrim: ~35 collections
- With 4 apps on screen: ~140 collections

Bug: 390581380
Doc: go/launcher-overview-unified-taskviewmodel
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Test: OverviewImageTest
Test: TaskViewModelTest
Change-Id: Ice68edef12c7e3b2a26107b0fc6e62578de241b4