[flexiglass] Rewrites lockscreen scene's DefaultBlueprint

Using the new LockscreenSceneLayout so it can lay itself out the right
way for all form factors.

Bug: 395060439
Bug: 405383415
Bug: 396218588
Bug: 396202921
Bug: 384077475
Bug: 394875986
Bug: 405366494
Bug: 390988286
Test: manually verified on a foldable device when folded and unfolded.
Also verified manually on a tablet in both orientations and on a device
with UDFPS
Test: unit/integration tests modified and added for view-model changes
Flag: com.android.systemui.scene_container

Change-Id: I40d0dc8d8dd4d25976127ed5b7a2ee0205e11976