[Flexi] Fix HomeStatusBarViewModelImplTests

We need a different way to unlock the screen in
tests when SceneContainerFlag is enabled.

Also, parameterized and cleaned up test duplication.

Bug: 416709930
Test: HomeStatusBarViewModelImplTest
Flag: com.android.systemui.scene_container
Change-Id: I96971cd9c7fe4775f4ec78f85027d030edb9b07c