Fix blocking issues re. window transitions and quick scrub

- Clean up the consumer when starting quickscrub/switch in addition to
  motion up
- Defer invalidating the handler until after quickscrub ends
- Ensure that we always finish the remote animation

Bug: 67957962
Bug: 70180755

Change-Id: Id5af5dc9917638f1dfb8e4a04c358aadb19fd67a