Blur glanceable hub UI when primary bouncer is showing

With the new transparent bouncer, we will see the glanceable hub UI behind the bouncer whenever we open some app from the hub.

Bug: 381263344
Test: unit tests
Test: verified manually, open glanceable hub, tap on any widget, bouncer should show up with the glanceable hub UI blurred in the background.
Flag: com.android.systemui.bouncer_ui_revamp
Change-Id: I3c82416fe88424c00124efe669f08e467658a945