Enable `assumeImmutableResults` in storage-counter

This commit solves https://gitlab.com/gitlab-org/gitlab/-/issues/338571
It enables `assumeImmutableResults` in the storage-counter.

ee/app/assets/javascripts/storage_counter/index.js

@@ -15,7 +15,7 @@ export default () => {
   } = el.dataset;
 
   const apolloProvider = new VueApollo({
-    defaultClient: createDefaultClient(),
+    defaultClient: createDefaultClient({}, { assumeImmutableResults: true }),
   });
 
   return new Vue({