Ensure taskbar animation ends when running window animation does

- Store the possible parallel animation to cancel/end in
  AbsSwipeUpHandler#endRunningWindowAnim()

Test: 1. remove taskbar during transition, ensure cleaned up properly
2. open a second app during transition to home, ensure taskbar
maintains correct visibility
Bug: 182512211

Change-Id: I71a6b6ce624113d43ad5a599cb5cfec28a555310