Remove DOMContentLoaded Eventlisteners

Removing DOMContentLoaded Eventlisteners from
index files since the scripts
are embedded using the defer tag.

ee/app/assets/javascripts/pages/projects/insights/index.js

 import initInsights from 'ee/insights';
 
-document.addEventListener('DOMContentLoaded', () => {
-  initInsights();
-});
+initInsights();

ee/app/assets/javascripts/pages/projects/quality/test_cases/index.js

 import initTestCaseList from 'ee/test_case_list/test_case_list_bundle';
 
-document.addEventListener('DOMContentLoaded', () => {
-  initTestCaseList({
+initTestCaseList({
   mountPointSelector: '#js-test-cases-list',
-  });
 });

ee/app/assets/javascripts/pages/projects/quality/test_cases/new/index.js

 import { initTestCaseCreate } from 'ee/test_case_create/test_case_create_bundle';
 
-document.addEventListener('DOMContentLoaded', () => {
-  initTestCaseCreate({
+initTestCaseCreate({
   mountPointSelector: '#js-create-test-case',
-  });
 });

ee/app/assets/javascripts/pages/projects/settings/ci_cd/show/index.js

@@ -6,11 +6,10 @@ import ProtectedEnvironmentEditList from 'ee/protected_environments/protected_en
 import showToast from '~/vue_shared/plugins/global_toast';
 import '~/pages/projects/settings/ci_cd/show/index';
 
-document.addEventListener('DOMContentLoaded', () => {
-  const el = document.getElementById('js-managed-licenses');
-  const toasts = document.querySelectorAll('.js-toast-message');
+const el = document.getElementById('js-managed-licenses');
+const toasts = document.querySelectorAll('.js-toast-message');
 
-  if (el && el.dataset && el.dataset.apiUrl) {
+if (el?.dataset?.apiUrl) {
   const store = createStore();
   store.dispatch('licenseManagement/setIsAdmin', Boolean(el.dataset.apiUrl));
   store.dispatch('licenseManagement/setAPISettings', { apiUrlManageLicenses: el.dataset.apiUrl });
@@ -26,13 +25,12 @@ document.addEventListener('DOMContentLoaded', () => {
       });
     },
   });
-  }
+}
 
-  toasts.forEach(toast => showToast(toast.dataset.message));
+toasts.forEach(toast => showToast(toast.dataset.message));
 
-  // eslint-disable-next-line no-new
-  new ProtectedEnvironmentCreate();
+// eslint-disable-next-line no-new
+new ProtectedEnvironmentCreate();
 
-  // eslint-disable-next-line no-new
-  new ProtectedEnvironmentEditList();
-});
+// eslint-disable-next-line no-new
+new ProtectedEnvironmentEditList();

ee/app/assets/javascripts/pages/trials/country_select.js

@@ -3,11 +3,10 @@ import axios from '~/lib/utils/axios_utils';
 import { __ } from '~/locale';
 import { deprecatedCreateFlash as Flash } from '~/flash';
 
-document.addEventListener('DOMContentLoaded', () => {
-  const selectElement = document.getElementById('country_select');
-  const { countriesEndPoint, selectedOption } = selectElement.dataset;
+const selectElement = document.getElementById('country_select');
+const { countriesEndPoint, selectedOption } = selectElement.dataset;
 
-  axios
+axios
   .get(countriesEndPoint)
   .then(({ data }) => {
     // fill #country_select element with array of <option>s
@@ -23,4 +22,3 @@ document.addEventListener('DOMContentLoaded', () => {
       .trigger('change.select2');
   })
   .catch(() => new Flash(__('Error loading countries data.')));
-});