[Flexiglass] Fix KeyguardCoordinator and parametrize tests

There is a slight change in behavior where before the statement would
filter transitions TO GONE and finished GONE which is an rather unusual
pattern. Now it will also allow transitions FROM GONE. I verified this
change with @jeffdq.

Bug: 349784682
Flag: com.android.systemui.scene_container
Test: added unit tests
Change-Id: I6e16e8bbdc5ee7711464495e2207096158dfa143