Merge "[Flexiglass] Set the top HUN height on the HeadsUpPlaceholder" into main

.../notifications/ui/composable/NotificationHeadsUpHeight.kt

...oid/systemui/notifications/ui/composable/Notifications.kt

...m/android/systemui/qs/ui/composable/QuickSettingsScene.kt

...statusbar/notification/row/ExpandableNotificationRow.java

...temui/statusbar/notification/row/NotificationMenuRow.java

...bar/notification/stack/NotificationStackScrollLayout.java

...stack/data/repository/NotificationViewHeightRepository.kt

...omain/interactor/NotificationStackAppearanceInteractor.kt

...sbar/notification/stack/ui/view/NotificationScrollView.kt

...ation/stack/ui/viewbinder/NotificationScrollViewBinder.kt

...ication/stack/ui/viewmodel/NotificationScrollViewModel.kt

...n/stack/ui/viewmodel/NotificationsPlaceholderViewModel.kt