migrate some tests to shell transitions

Without a transition player registered, the system
(and thus some tests) were still executing parts of
legacy code. With a fallback-player, it means that
shell-transitions is always active.

This migrates some tests which were relying on
legacy logic over to shell transitions logic to unblock
roll-out of the fallback player.

Bug: 365884835
Test: these are the tests
Flag: com.android.window.flags.fallback_transition_player
Change-Id: I53025efb17319a0b2b53a504fd57754ee09e2fe0