[Scene container] Disable boot to GONE

Some part of the transition implemented for flag off is missing here.
There are two things achieved with this:
1. Keyguard is hidden when the setup wizard is shown. This part is
already implemented in scene container by disabling visibility instead
of going to Gone. See [SceneContainerStartable.hydrateVisibility]. We
might want to unify this logic here.
2. When the auth method is set to NONE device boots into Gone
(Launcher). For this we would just need to call changeScene(Scene.Gone).
Unfortunately STL doesn't seem to be initialized at this point,
therefore it needs a different solution.

Bug: 336576536
Flag: com.android.systemui.scene_container
Test: manual smoke test
Change-Id: If6425f1a23b6cdbffa44486567efd87a9fdc31c9