Add logs to make sure PiP transaction is applied

Add logs in RecentsController to make sure that the
PictureInPictureSurfaceTransaction is applied properly
in RecentsController#finishInner(). Make sure that we have
a proper PiP task token; otherwise, we should try to use the taskId
to get the PiP leash.

Bug: 311084698
Test: swipe PiP to home with auto-enter enabled
Change-Id: Ib7233265ff5c7c42db41c0361564b550da99e874