Skip intermediate resizing when running swipe-pip transition

PipBoundsState may keep old state before handleSwipePipToHomeTransition
is called. So if before the transition is done, it should avoid
to use the state to update size. The destination size and layout will
be handled by the transition.

Legacy transition didn't have the race because it always handles
the animation in onTaskAppeared directly, it is done before
receiving config change.

Bug: 285086073
Test: Drag resize a video auto-PiP activity to close screen width
      in portrait. Expand it to fullscreen in landscape. Use
      gesture to swipe from bottom. The PiP activity should not
      disappear or show at wrong position a few frames.
Change-Id: I9bd6ebbfffe6725acabcf111ad5cd4d2cc55ea95
(cherry picked from commit cc71768d)