Fix jank in CUJ_SCREEN_OFF

Use Choreographer to delay animation and mitigate jank in J<SCREEN_OFF>

 - Before: screen/7zBd9XaaUZBeefS

 - After: screen/iSy6BKoEp3U3Gto

Test: Enable AOD, go to home screen, capture perfetto trace, press
      power button to turn off screen, inspect trace for jank
Bug: 262705829
Change-Id: Ic0a06d3d759981f61d4f85cb31841034339b98ca