feat: Implement isCheckEnterprise middleware

packages/backend/src/helpers/check-is-enterprise.js

@@ -0,0 +1,9 @@
+import { hasValidLicense } from './license.ee.js';
+
+export const checkIsEnterprise = async (request, response, next) => {
+  if (await hasValidLicense()) {
+    next();
+  } else {
+    return response.status(404).end();
+  }
+};