Only animate bubbles when in app

We currently animate bubbles on home but the animation hasn't been implemented properly yet, so ensure we don't play the animation on home.

This also deflakes some tests that fail because we're not yet handling interruptions while animations are playing.

Flag: ACONFIG com.android.wm.shell.enable_bubble_bar DEVELOPMENT
Bug: 280605846
Fixes: 333796110
Fixes: 333910495
Fixes: 336086185
Test: https://android-build.corp.google.com/builds/tests/view?invocationId=I78600010269170812&testResultId=TR95029270629703599&redirect=http://fusion2/ac10ec72-4e02-4573-86be-59ecb823ecd1
Change-Id: I99de02cbaebeb6c930a1368ea65562aa178f6762