Implement transition from alternate bouncer -> dreaming

Currently the transition doesn't exist, so if user opens alternate
bouncer but then lets the device timeout to dream, the device ends up in
a bad state.

Bug: 396153527
Test: atest FromAlternateBouncerTransitionInteractorTest
Flag: com.android.systemui.glanceable_hub_v2
Change-Id: I9bda3d5e82f393f71d7a7daaa256cbf40c6d3e29