Set AccessibilityPaneTitle for taskbar view

we need to set pane title for taskbar view so accessibility service knows to focus/unfocus on it upon it appearing and disappearing

Test: Manual
Bug: 284081291
Flag: Not needed
Change-Id: I5404c97bdc3e1d3308942cd907e7f7701a04bee3
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
index bc1a2c8..56c423e 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
@@ -208,6 +208,8 @@
     }
 
     protected void init(TaskbarViewController.TaskbarViewCallbacks callbacks) {
+        // set taskbar pane title so that accessibility service know it window and focuses.
+        setAccessibilityPaneTitle(getContext().getString(R.string.taskbar_a11y_title));
         mControllerCallbacks = callbacks;
         mIconClickListener = mControllerCallbacks.getIconOnClickListener();
         mIconLongClickListener = mControllerCallbacks.getIconOnLongClickListener();