Improve Volume Dialog measurement performance

Rework nested MotionLayout to ConstraintLayout + MotionLayout. Removing
ConstraintLayout would be problematic, but this saves us around 3ms on
the first measure which brings it to a parity with the previous
implementation.

This CL also marks the UI coroutins for tracibility.

Flag: com.android.systemui.volume_redesign
Bug: 369993959
Test: atest VolumeDialogScreenshotTest
Test: manual on foldable. Fold device when showing volume dialog
Change-Id: Idd7c0c45e88c121d3d9f2379ac5711ba346c3d46