MM-40414: Add empty state icons (#25282)

Automatic Merge

webapp/channels/src/plugins/test/__snapshots__/main_menu_action.test.tsx.snap

@@ -60,7 +60,7 @@ exports[`plugins/MainMenuActions should match snapshot in mobile view with some
         id="flaggedPosts"
         onClick={[Function]}
         show={true}
-        text="Saved Posts"
+        text="Saved messages"
       />
     </MenuGroup>
     <MenuGroup>