load usage ping script on admin settings subpage only

app/assets/javascripts/pages/admin/application_settings/index.js

 import initSettingsPanels from '~/settings_panels';
 import projectSelect from '~/project_select';
-import UsagePingPayload from './usage_ping_payload';
 
 document.addEventListener('DOMContentLoaded', () => {
   // Initialize expandable settings panels
   initSettingsPanels();
   projectSelect();
-  new UsagePingPayload(
-    document.querySelector('.js-usage-ping-payload-trigger'),
-    document.querySelector('.js-usage-ping-payload'),
-  ).init();
 });

app/assets/javascripts/pages/admin/application_settings/metrics_and_profiling/index.js

+import UsagePingPayload from './../usage_ping_payload';
+
+document.addEventListener('DOMContentLoaded', () => {
+  new UsagePingPayload(
+    document.querySelector('.js-usage-ping-payload-trigger'),
+    document.querySelector('.js-usage-ping-payload'),
+  ).init();
+});