Undo changes to sidebar in Root.tsx used for testing

Signed-off-by: hiba-aldalaty <hibaaldalaty@gmail.com>

packages/app/src/components/Root/Root.tsx

@@ -43,8 +43,6 @@ import {
   SidebarDivider,
   SidebarSpace,
   SidebarScrollWrapper,
-  SidebarSubmenu,
-  SidebarSubmenuItem,
 } from '@backstage/core-components';
 import { AzurePullRequestsIcon } from '@backstage/plugin-azure-devops';