Defer remove splash screen while device is locked

...and activity does not request showWhenLocked.
The splash screen won't contains secure information, so it's safe to
declared as showWhenLocked. But before remove starting window, if the
activity does not request showWhenLocked and device is locked, try to
trigger unoccluding animation, and keep app window hide until transition
animation finish.

Bug: 378088391
Bug: 383131643
Test: run simulate app repeatly, verify the app content won't be visible
during transition animation.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:17d7a10aa573a74d829fd05c8848b0ac8e40be8a)
Merged-In: Id4db3772950059803883d00f9dd6b94aa98382f0
Change-Id: Id4db3772950059803883d00f9dd6b94aa98382f0