Convert KeyguardlessScene into using SceneContainerStartable.

The scene will remain the same, but SceneContainerStartable now has
logic to no-op on scenes a device does not support.

Bug: 2982234162
Test: Build
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Change-Id: I3940244588fe51254b7c74595b057e15dc8d783f
8 files changed