add missing api call to rest.js

jam-ui/src/helpers/rest.js

@@ -433,6 +433,14 @@ export const addJamtrackToShoppingCart = (options = {}) => {
   });
 };
 
+export const getAppFeatures = (env) => {
+  return new Promise((resolve, reject) => {
+    apiFetch(`/app_features?env=${env}`)
+      .then(response => resolve(response))
+      .catch(error => reject(error));
+  });
+}
+
 export const getShoppingCart = () => {
   return new Promise((resolve, reject) => {
     apiFetch(`/shopping_carts`)