[OOBE] Update the notification when the device disconnects

Create a combined flow for the change of the keyboard/touchpad
connection states. The notification coordinator should collect from this
flow after the initial notification is sent, and update or cancel it
accordingly.

Fixes: 391803159
Flag: com.android.systemui.shared.new_touchpad_gestures_tutorial
Test: TutorialNotificationCoordinatorTest.kt
Change-Id: I1732d9af3babe163e5097b82f4afa9afb77dfe36