feat: Convert all query files to JS

packages/backend/src/graphql/queries/get-app-config.ee.js

@@ -0,0 +1,17 @@
+import AppConfig from '../../models/app-config';
+
+const getAppConfig = async (_parent, params, context) => {
+  context.currentUser.can('create', 'Connection');
+
+  const appConfig = await AppConfig.query()
+    .withGraphFetched({
+      appAuthClients: true,
+    })
+    .findOne({
+      key: params.key,
+    });
+
+  return appConfig;
+};
+
+export default getAppConfig;