Fix notifications not showing when exiting hub

When going from HUB->OCCLUDED->HUB->LOCKSCREEN, the notifications on the
lockscreen aren't shown. This is due to the fact that keyguardAlpha
remains stuck at 0. So we add the glanceable hub transition view models
here to ensure the keyguard alpha gets updated correctly.

Fixes: 345775661
Test: atest SharedNotificationContainerViewModelTest
Flag: com.android.systemui.communal_hub
Change-Id: I84bbeebdd5787419be1ece692dd771ca2d074f50