Hide communal hub before strong auth granted

Test: atest KeyguardRepositoryImplTest
Test: atest CommunalWidgetRepositoryImplTest
Test: atest CommunalInteractorTest
Test: atest CommunalInteractorCommunalDisabledTest
Test: verified on device that communal hub is hidden after reboot
Bug: 317275638
Fix: 317275638
Flag: ACONFIG com.android.systemui.communal_hub DEVELOPMENT
Change-Id: I3d2c6670252d0ea081acf81f3ce0db6c7a1e8763