Interrupt bubble animation on stash change

This change handles cancelling the currently running bubble animation when the stash state is changing.

Demo - http://recall/-/bJtug1HhvXkkeA4MQvIaiP/4jnBgnFaIPez6m7fVLSlf

Flag: ACONFIG com.android.wm.shell.enable_bubble_bar DEVELOPMENT
Bug: 280605846
Test: atest BubbleBarViewAnimatorTest
Change-Id: I34628f8ad741228dd21285ad66e45ef2909fbdab

quickstep/src/com/android/launcher3/taskbar/bubbles/BubbleBarViewController.java

@@ -172,6 +172,13 @@ public class BubbleBarViewController {
         }
     }
 
+    /** Notifies that the stash state is changing. */
+    public void onStashStateChanging() {
+        if (isAnimatingNewBubble()) {
+            mBubbleBarViewAnimator.onStashStateChangingWhileAnimating();
+        }
+    }
+
     //
     // The below animators are exposed to BubbleStashController so it can manage the stashing
     // animation.