Ui/transform role edit updates transformations (#9910)

* Update transform role delete button to be ConfirmAction with dropdown

* Set backend on fetched record so that it saves correctly

* Update transformation after role transformations changed works

* Clean up transform adapter

* Add role to allowed_roles on added transformations and remove from removed transformations on role save, with flash message

* Add backend to transform role model, and update serializer to add backend to paginated results

* Clean up error message handling

* Connect backend to transform roles list response

* Capabilities on transform roles is correct

* Fix cancel button on transform role edit location

* Fix model path

* Remove unnecessary tab param from controller

* Add backend to transform model

ui/app/models/transform.js

@@ -90,9 +90,12 @@ const Model = DS.Model.extend({
   transformFieldAttrs: computed('transformAttrs', function() {
     return expandAttributeMeta(this, this.get('transformAttrs'));
   }),
+
+  backend: attr('string', {
+    readOnly: true,
+  }),
 });
 
 export default attachCapabilities(Model, {
-  // TODO: Update to dynamic backend name
-  updatePath: apiPath`transform/transformation/${'id'}`,
+  updatePath: apiPath`${'backend'}/transformation/${'id'}`,
 });