Poll folder for changes in new environments page

In the old page, the folder followed the main endpoint's polling
interval. This replicates that in the new page by using Apollo's poll
interval mechanism.

Changelog: fixed

app/assets/javascripts/environments/components/new_environment_folder.vue

 <script>
 import { GlButton, GlCollapse, GlIcon, GlBadge, GlLink } from '@gitlab/ui';
 import { __, s__ } from '~/locale';
+import pollIntervalQuery from '../graphql/queries/poll_interval.query.graphql';
 import folderQuery from '../graphql/queries/folder.query.graphql';
 import EnvironmentItem from './new_environment_item.vue';
 
@@ -20,7 +21,7 @@ export default {
     },
   },
   data() {
-    return { visible: false };
+    return { visible: false, interval: undefined };
   },
   apollo: {
     folder: {
@@ -28,6 +29,12 @@ export default {
       variables() {
         return { environment: this.nestedEnvironment.latest };
       },
+      pollInterval() {
+        return this.interval;
+      },
+    },
+    interval: {
+      query: pollIntervalQuery,
     },
   },
   i18n: {