Enable `assumeImmutableResults` in pipeline analytics graphs

This commit solves https://gitlab.com/gitlab-org/gitlab/-/issues/338442
It enables `assumeImmutableResults` in the pipeline analytics graphs.

app/assets/javascripts/projects/pipelines/charts/index.js

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