Makes the network policy, "fetch only" for designs

changelogs/unreleased/13231-apollo-discussion-caching.yml

+---
+title: Removes caching for design tab discusisons
+merge_request: 20374
+author:
+type: changed

ee/app/assets/javascripts/design_management/pages/design/index.vue

@@ -57,6 +57,7 @@ export default {
     },
     design: {
       query: getDesignQuery,
+      fetchPolicy: 'network-only',
       variables() {
         return this.designVariables;
       },