Fix recents order being reversed sometimes

Occasionally, the recents list items were reversed.  This is because
RecentsTaskList#getTasks returns the actual backing list which we were
reversing, so we solve this by making a new array list.

Bug: 131367388
Test: Do repro in bug, no longer gives reversed order
Change-Id: I825d284e4768c2b53fedf07480e99d195acfa6d6

go/quickstep/src/com/android/quickstep/TaskListLoader.java

@@ -80,7 +80,8 @@ public final class TaskListLoader {
             return;
         }
         // TODO: Look into error checking / more robust handling for when things go wrong.
-        mTaskListChangeId = mRecentsModel.getTasks(tasks -> {
+        mTaskListChangeId = mRecentsModel.getTasks(loadedTasks -> {
+            ArrayList<Task> tasks = new ArrayList<>(loadedTasks);
             // Reverse tasks to put most recent at the bottom of the view
             Collections.reverse(tasks);
             // Load task content