Only allow swiping to the hub from the lockscreen

This prevents swiping to the hub from other states, such as AOD

Bug: 399910239
Test: atest CommunalViewModelTest
Test: no longer able to swipe into hub from AOD
Flag: com.android.systemui.glanceable_hub_v2
Change-Id: I45db712b8df29b9ac3f571c15b3446896e5b9ad1