Do not allow exit PiP during swipe up

Block any exitPip calls (e.g. due to onActivityRestartAttempt)
while swiping PiP to Home animation is running in Launcher.

Bug: 345752591
Flag: EXEMPT bugfix
Test: swipe up to enter PiP and quickly tap icon to expand
Change-Id: I5b1def9a25efb391ec92679529d0d473b2aed87b