Tweak animation for non-app windows with shell fixed rotation

To make it have the same behavior as legacy transition:
The bars are faded out when starting fixed rotation, and faded in
after display rotation change is completed. And the independent
seamless window such as round corner can keep showing on screen
seamlessly.

Also skip animation for seamless display change. Otherwise there will
be a no-op alpha animation with DEFAULT_APP_TRANSITION_DURATION=336ms
that adds unnecessary delay to finish the transition.

Bug: 221223435
Test: atest TransitionTests#testAppTransitionWithRotationChange
Change-Id: I3b1db4956b642fabb6061c7dbf0f7b2b8e1e300f