Merge pull request #2320 from spotify/shmidt-i/fix-404-route

Fix 404 route for frontend

packages/core-api/src/app/App.tsx

@@ -191,7 +191,7 @@ export class PrivateAppImpl implements BackstageApp {
       FeatureFlags.registeredFeatureFlags = registeredFeatureFlags;
     }
 
-    routes.push(<Route element={<NotFoundErrorPage />} />);
+    routes.push(<Route path="/*" element={<NotFoundErrorPage />} />);
 
     return routes;
   }