Fix no back animations when the target window is animating

Let the back navigation could defer the back animation and could handle
it after the running transition finished.

The participated targets in back navigation could be calculated and hide
when the transition is running. To prevent these targets and their
parents being invisible and reset transform when transition finished,
this CL will handle the deferred animation when transition finished and
call animation cancel if the targets are not participated.

Bug: 264716523
Test: launch activity and quickly trigger back navigation
Change-Id: I2f3ceb28c0973d1c417c355788bc53eb0702be4f