refactor: rewrite test connection with RQ

packages/backend/src/graphql/query-resolvers.js

@@ -1,13 +1,11 @@
 import getAppAuthClient from './queries/get-app-auth-client.ee.js';
 import getConnectedApps from './queries/get-connected-apps.js';
 import getDynamicData from './queries/get-dynamic-data.js';
-import testConnection from './queries/test-connection.js';
 
 const queryResolvers = {
   getAppAuthClient,
   getConnectedApps,
   getDynamicData,
-  testConnection,
 };
 
 export default queryResolvers;