Enable `assumeImmutableResults` in usage trends

This commit solves https://gitlab.com/gitlab-org/gitlab/-/issues/338423
It enables `assumeImmutableResults` in the usage trends.

app/assets/javascripts/analytics/usage_trends/index.js

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