Clean up pip state if task is opening in bubbles

When convering a task to a bubble and it is running in PIP, clean up the
PIP state.
Bubble transition handler will take care of the animation.
Pip handler will clean up the state.

Bug: 418307708
Test: manual, open Youtube and enter PIP, long press on Youtube icon on
  home screen to enter bubble, collapse Youtube bubble and start split
  screen from Calculator, choose Youtube as the second split pair. Check
  that Youtube shows up in split (if pip state is not cleared up, it
  would skip split screen).
Flag: com.android.wm.shell.enable_create_any_bubble
Change-Id: I5e3ad182c5d8482c2ebed004b8ddef4f07dcf25a