Jumpcut animation to exit PiP while entering PiP

If onActivityRestartAttempt() request comes into
PiP to PipTaskOrganizer#exitPip() and if we are still
entering PiP, jump-cut the enter-PiP animation to its end
submitting finishWCT as usual via animator callback
and allow for a runnable to be run right after to
exitPip() for instance.

Bug: 322419955
Test: manually reproduce the steps in the bug
Change-Id: Ib703ee8095c48df60db2cd211831c7e648b4d374