Remove CommunalContainer touch forwarding

Now that CommunalContainer is at the bottom of
NotificationShadeWindowView, there's no need to forward touches to the
other shade components. Logic is removed and responsibility for
sending user activitiy events on touch is moved next to the rest of the
custom touch handling for the hub.

Bug: 308813166
Test: atest GlanceableHubContainerControllerTest
Test: manually verified touches work as expected and that screen
      doesn't time out when interacting with the hub
Flag: ACONFIG com.android.systemui.communal_hub DEVELOPMENT
Change-Id: I96a2f702f361f065059c75adf981c61c0b4b106a