optional hide notifications shade on ALL_APPS key

Create boolean config_enableHideNotificationsShadeOnAllAppsKey to hide
notifications shade when a user presses ALL_APPS key to show the apps
drawer. The notifications shade will animate away as the apps drawer
animates in.

tablet with config enabled (default false):
go/scrcast/NDUwNzk0MDMwMzE0MjkxMnwwNWUwYTFjNy1jZA

desktop with config enabled (default true):
go/scrcast/NjY4NTU2MDY5NjQ3MTU1MnwxYWFhMmQwZS1jNQ

Bug: 433185712
Test: press ALL_APPS key on desktop
Test: atest SystemUITests
Flag: com.android.systemui.scene_container
Change-Id: I691bd850ed53d658c2dfa49b0b5b5b6e3a2b8bc8