[flexiglass] Disable unnecessary CentralSurfacesImplTests

Disable testKeyguardHideDelayedIfOcclusionAnimationRunning and
testKeyguardHideNotDelayedIfOcclusionAnimationNotRunning when
Flexiglass is enabled as they are just verifying that the
StatusBarStateController state is set which is not implemented for
Flexiglass at all.

Test: CentralSurfacesImplTest
Bug: 427066068
Flag: com.android.systemui.scene_container

Change-Id: Iffc21682c676b5ab83dbeb356bd0cf15c8abee43