Adds CHANGELOG entry

app/assets/javascripts/environments/components/environment_item.js.es6

@@ -23,8 +23,8 @@
    */
   window.gl = window.gl || {};
-  gl.environmentsList = window.gl.environmentsList || {};
-  gl.environmentsList.timeagoInstance = new timeago(); // eslint-disable-line
+  window.gl.environmentsList = window.gl.environmentsList || {};
+  window.gl.environmentsList.timeagoInstance = new timeago(); // eslint-disable-line
   gl.environmentsList.EnvironmentItem = Vue.component('environment-item', {

app/assets/javascripts/environments/stores/environments_store.js.es6

 /* eslint-disable no-param-reassign */
 (() => {
   window.gl = window.gl || {};
-  gl.environmentsList = window.gl.environmentsList || {};
+  window.gl.environmentsList = window.gl.environmentsList || {};
   gl.environmentsList.EnvironmentsStore = {
     state: {},

changelogs/unreleased/25725-remove-window-object.yml

+---
+title: Removes unneeded `window` declaration in environments related code
+merge_request: 8456
+author: