[Desktop Windowing] Split some test scenarios into functional tests

We don't want to add extra screenrecordings to jank tests, so to avoid
marking test scenarios (that jank tests are based on) with the
@ScreenRecord rule we here create separate functional tests for those
scenarios and annotate those with the rule instead.

Test: atest
Bug: 408367637
Flag: EXEMPT test fix
Change-Id: Ic14341e6a09fd8bb9059ac64ddd19161ea05a573