Remove obsolete DOMContentLoadedEventListener

app/assets/javascripts/pages/projects/forks/new/index.js

 import Vue from 'vue';
 import ForkGroupsList from './components/fork_groups_list.vue';
 
-document.addEventListener('DOMContentLoaded', () => {
-  const mountElement = document.getElementById('fork-groups-mount-element');
-
-  const { endpoint } = mountElement.dataset;
-
-  return new Vue({
-    el: mountElement,
-    render(h) {
-      return h(ForkGroupsList, {
-        props: {
-          endpoint,
-        },
-      });
-    },
-  });
+const mountElement = document.getElementById('fork-groups-mount-element');
+const { endpoint } = mountElement.dataset;
+// eslint-disable-next-line no-new
+new Vue({
+  el: mountElement,
+  render(h) {
+    return h(ForkGroupsList, {
+      props: {
+        endpoint,
+      },
+    });
+  },
 });