Call stopInflation() on bubbles we're removing.

Bubbles that cancel themselves in onCreate (and less frequently, onResume) are sometimes removed before inflation finishes. Then, when inflation does finish, we call notificationEntryUpdated in the callback at BubbleController#1106 which re-adds the bubble while it's being removed.

This resulted in unpredictably inconsistent states between BubbleData and BubbleStackView, causing a variety of pretty bad issues.

Test: modified bubble test app to cancel its own notifications in onCreate/onResume
Bug: 159861400
Change-Id: I9716dc60bd664b612437906af1d5c76f9f0755ff