Ignore all glanceable hub touches when notification shade is open

With the newest keyguard flags enabled, touches from the shade seem to
make it down to the glanceable hub. This bypasses our top-level touch
handling logic in GlanceableHubContainerController so this change just blocks
touches when the shade is open.

Bug: 323265343
Test: verified manually on device
Flag: ACONFIG com.android.systemui.communal_hub STAGING
Change-Id: If074e0453e5b3168e72ee0a213c1ab8df8788031