Fix the overflow button getting stuck in the dot position

The root cause was that there were other unaccounted code paths inside
`KeyboardQuickSwitchViewController` that were causing the KQS view
to be closed.

The fix introduces a new `onCloseStarted` callback that is called before
closing the KQS view. This allows to toggle the overflow button together
with the KQS closing animation (in case it closes with animation).

Bug: 379614917
Flag: com.android.launcher3.taskbar_overflow
Test: manual, following steps in the bug
Change-Id: I1868142c1cdba8111cb86c4c54e5b12b643732c5

quickstep/src/com/android/launcher3/taskbar/KeyboardQuickSwitchViewController.java

@@ -198,6 +198,7 @@ public class KeyboardQuickSwitchViewController {
             // Let currently-running animation finish.
             return;
         }
+        mControllerCallbacks.onCloseStarted();
         if (!animate) {
             InteractionJankMonitorWrapper.begin(
                     mKeyboardQuickSwitchView, Cuj.CUJ_LAUNCHER_KEYBOARD_QUICK_SWITCH_CLOSE);