Make TasksRepository listen to changes in task visuals and update

To do this TaskVisualsChangedDelegate was added which multiplexes two listeners that are closely related.

Thumbnail overriding capabilities were also removed.

Fix: 342560598
Test: TaskVisualsChangedDelegateTest, TasksRepositoryTest
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Change-Id: If065e4179cd1f15fe2cdf9b6bae51afcb57abcc6

quickstep/src/com/android/quickstep/views/RecentsView.java

@@ -1079,7 +1079,6 @@ public abstract class RecentsView<
     @Nullable
     public Task onTaskThumbnailChanged(int taskId, ThumbnailData thumbnailData) {
         if (enableRefactorTaskThumbnail()) {
-            mHelper.onTaskThumbnailChanged(taskId, thumbnailData);
             return null;
         }
         if (mHandleTaskStackChanges) {
@@ -1100,8 +1099,7 @@ public abstract class RecentsView<
     }
 
     @Override
-    public void onTaskIconChanged(String pkg, UserHandle user) {
-        // TODO(b/342560598): Listen in TaskRepository and reload.
+    public void onTaskIconChanged(@NonNull String pkg, @NonNull UserHandle user) {
         for (int i = 0; i < getTaskViewCount(); i++) {
             TaskView tv = requireTaskViewAt(i);
             Task task = tv.getFirstTask();
@@ -2549,7 +2547,6 @@ public abstract class RecentsView<
         }
 
         if (enableRefactorTaskThumbnail()) {
-            // TODO(b/342560598): Listen in TaskRepository and reload.
             return;
         }