temp: reverse stack order of discussions and upsell in sidebar (#1705)

Co-authored-by: Ayesha Waris <ayesha.waris@192.168.10.27>

Author: ayesha-waris

src/courseware/course/new-sidebar/sidebars/discussions-notifications/DiscussionsNotificationsSidebar.tsx

@@ -21,9 +21,9 @@ const DiscussionsNotificationsSidebar = () => {
       showTitleBar={false}
       showBorder={false}
     >
-      <NotificationTray />
-      {!hideNotificationbar && <div className="my-1.5" />}
       <DiscussionsSidebar />
+      {!hideNotificationbar && <div className="my-1.5" />}
+      <NotificationTray />
     </SidebarBase>
   );
 };