[Dual Shade] Include all shade ContentKeys in SceneContainer config.

Now that ShadeMode.Dual is determined dynamically at runtime, we should
include both the shade OverlaysKeys as well as single/split shade
SceneKeys in the SceneContainer config.

Bug: 388793191
Test: Unit tests still pass.
Flag: com.android.systemui.scene_container
Change-Id: I07f1012f2164a80f2719f32e016f82bd2304160b