Desktop-Minimize: move CUJ handling to MinimizeAnimator

- Move CUJ handling for the Desktop window minimize animation from
DesktopTasksLimiter to MinimizeAnimator.
- Also add ShellAnimationThread Handler to be able to pass such a Handler
to InteractionJankMonitor for the minimize-window animation in
FreeformTaskTransitionHandler.

Flag: NONE jank/logging only change
Test: manual (perfetto)
Bug: 374206096
Bug: 385051575
Change-Id: Id2bb7fa223ebdafb301c853941282f9c8a533b57