[ML] Adjust permissions for ml_ui_extras role (#61055)

This PR removes the cluster:manage permission from the ml_ui_extras role as this is no longer needed.

x-pack/test/functional/services/machine_learning/security_common.ts

@@ -42,7 +42,7 @@ export function MachineLearningSecurityCommonProvider({ getService }: FtrProvide
     {
       name: 'ml_ui_extras',
       elasticsearch: {
-        cluster: ['manage', 'manage_ingest_pipelines', 'monitor'],
+        cluster: ['manage_ingest_pipelines', 'monitor'],
       },
       kibana: [],
     },