Bubbles ignore gestures when notif expanded

When bubbles are expanded we monitor for home gesture to animate
collapsig of the view.
When notification panel is open, it is on top of bubbles. But our
gesture monitor is still active. Listen to notification panel expanded
state and stop listening for home gesture while panel is expanded.

Bug: 232339931
Test: atest PlatformScenarioTests:android.platform.test.scenario.sysui.bubble.BubblesHomeGestureTest
Change-Id: I123ea6b5b82906d2ed1b0a71fc1e2fa9669abfff