feat: Convert all app files to JS

packages/backend/src/apps/zendesk/common/add-auth-headers.js

@@ -0,0 +1,15 @@
+const addAuthHeader = ($, requestConfig) => {
+  const { instanceUrl, tokenType, accessToken } = $.auth.data;
+
+  if (instanceUrl) {
+    requestConfig.baseURL = instanceUrl;
+  }
+
+  if (tokenType && accessToken) {
+    requestConfig.headers.Authorization = `${tokenType} ${$.auth.data.accessToken}`;
+  }
+
+  return requestConfig;
+};
+
+export default addAuthHeader;