Fix race condition in LockscreenSceneTransitionInteractor

LockscreenSceneTransitionInteractor did rely on sharedFlows which might
be not up-to-date and therefore caused a race condition. With the recent
addition of currentTransitionInfoInternal we are able to get the most
recent transition info.

Test: Ignored unit test now working
Test: Manual test of the scenario in the bug
Bug: b/340616271
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Change-Id: I435036354ec76f68600c72acee280e5f14d695bb