Implement auto-enter PiP2 in gesture nav [3/N]

Implement auto-enter PiP in PiP2 while in gesture
navigation mode.

Set config at end to true for the PiP task token
when requesting to handle enter PiP transition.

Make sure, we apply the correct startTransaction
in swipe PiP to Home when source-rect-hint is valid.

Bug: 325481148
Test: swipe up to enter PiP w/ auto-enter + valid src-rect-hint
Change-Id: Id6bdbd1951cb40b73a4f48b06dfa49f53c447205