Enable `assumeImmutableResults` in group repo analytics

This commit solves https://gitlab.com/gitlab-org/gitlab/-/issues/338560
It enables `assumeImmutableResults` in the group repo analytics.

ee/app/assets/javascripts/analytics/repository_analytics/index.js

@@ -6,7 +6,7 @@ import GroupRepositoryAnalytics from './components/group_repository_analytics.vu
 Vue.use(VueApollo);
 
 const apolloProvider = new VueApollo({
-  defaultClient: createDefaultClient(),
+  defaultClient: createDefaultClient({}, { assumeImmutableResults: true }),
 });
 
 export default () => {