Defer rotation change while running display change transition

This aligns the behavior of shell transition with legacy transition.
The rotation change will be skipped if there is a display change
transition. And then after the transition is finished, check again
if there is still a change to send.
The benefits:
 1. If the new transition will cancel previous transition (current
    behavior), it can avoid jump cut that the display transition
    will go to the end state directly.
 2. If the new transition will be queued, it may avoid unnecessary
    temporal states change from preempting CPU with animation.
 3. It may make some tests stabler that the sync state and async
    rotation controller won't need to worry about crossing transition
    if the tests request changing various rotations in a short time.

Also optimize WMS#updateRotationUnchecked a bit, which eliminates an
unnecessary surface placement if nothing is changed.

Bug: 234585256
Bug: 209920544
Test: AppConfigurationTests

Change-Id: I6a0e9ae7449dc361998e1f8066a76dd4647ae0b0