add missing test role descriptor

Author: legrego

x-pack/test/functional/config.js

@@ -334,6 +334,20 @@ export default async function ({ readConfigFile }) {
           ],
         },
 
+        global_upgrade_assistant_role: {
+          elasticsearch: {
+            cluster: ['manage'],
+          },
+          kibana: [
+            {
+              feature: {
+                discover: ['read'],
+              },
+              spaces: ['*'],
+            },
+          ],
+        },
+
         //Kibana feature privilege isn't specific to advancedSetting. It can be anything. https://github.com/elastic/kibana/issues/35965
         test_api_keys: {
           elasticsearch: {