Update BubbleBarLayerViewTest for bubble to fullscreen flag

With the new drop target manager, the left / right zones for
bubbles are different (as per UX spec) than they were before.

Updated the existing test to require bubble flags to be
disabled and added new tests that use the new zones.

Flag: com.android.wm.shell.enable_bubble_to_fullscreen
Test: atest BubbleBarLayerViewTest
Bug: 402891988
Change-Id: I0e0109d96cf083054434cde6d48f60509ffb5e00