Enable `assumeImmutableResults` in environment list

This commit solves https://gitlab.com/gitlab-org/gitlab/-/issues/338428
It enables `assumeImmutableResults` in the environment list.

app/assets/javascripts/environments/index.js

@@ -9,7 +9,7 @@ Vue.use(Translate);
 Vue.use(VueApollo);
 
 const apolloProvider = new VueApollo({
-  defaultClient: createDefaultClient(),
+  defaultClient: createDefaultClient({}, { assumeImmutableResults: true }),
 });
 
 export default () => {