Fix glanceable hub not showing when waking from doze

Some timings seem to have changed and the device is now consistenly
awake before the doze dream has finished, so we now use "false" for the
isScreenOn parameter when quering canStartDreaming.

We debounce the occluded signal instead of reading it immediately when
waking since it can lag behind the dream stopping when power cycling
rapidly.

Also fixes the notifications showing when transitioning from doze to
hub.

Bug: 363239820
Test: atest FromDozingTransitionInteractorTest SharedNotificationContainerViewModelTest
Flag: com.android.systemui.communal_hub
Change-Id: Ib5a356ad59f0002b40dc112ab77b607c37fffe1f