Suppress bubble animation when bar is hidden

This change suppresses the new bubble animation when the notification shade is open and when the device is locked.

Flag: ACONFIG com.android.wm.shell.enable_bubble_bar DEVELOPMENT
Fixes: 332912942
Test: manual
     - Use test app to trigger a bubble with delay
     - Lock the device/pull down the notification shade
     - Observe the bubble is not animating
     - Unlock/collapse the shade
     - Observe new bubble was added to the bubble bar
Change-Id: I0b1d42a9d57b29807f113ae45ff60349341272ef