[flexiglass] Implement QS/Lockscreen scrim transitions

Implements the following transitions:
- Gone to QS
- Lockscreen to QS
- Lockscreen to Shade

The notification scrim is used to mask out the background scrim in all of these transitions.

Bug: 330478890
Bug: 330702510
Bug: 330484293
Test: checked all affected scene transitions look correct
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Change-Id: Ic5d7ca17cb7c4d5a9ab1d717f573b9839ccc5c83