Fix misc issues for transition to hub when turning screen on

This CL fixes various timing issues when showing the dream when wkaing
from doze, especially when pressing power button quickly:
* Dream doesn't start under the hub sometimes
* Hub transitions to dream or occluded when dream starts underneath
* Device doesn't transition to hub when pressing power quickly and
  skipping the DOZING keyguard state
* Keyguard state goes to OCCLUDED instead of DREAMING when closing hub
  shortly after dream starts underneath hub

Manually verified on device while dreaming with various sleep timings:
adb shell input keyevent POWER && sleep 0.8 && adb shell input keyevent POWER

Bug: 363239820
Test: atest CommunalSceneTransitionInteractorTest FromDreamingTransitionInteractorTest
Flag: com.android.systemui.communal_hub
Change-Id: Ida1ee5880099a060b348e1977a951d04cb73102a