Move cluster_health to core

This moves the frontend components
of the cluster health feature to core

app/assets/javascripts/pages/admin/clusters/show/index.js

 import ClustersBundle from '~/clusters/clusters_bundle';
+import initClusterHealth from '~/pages/projects/clusters/show/cluster_health';
 
 document.addEventListener('DOMContentLoaded', () => {
   new ClustersBundle(); // eslint-disable-line no-new
+  initClusterHealth();
 });

app/assets/javascripts/pages/groups/clusters/show/index.js

 import ClustersBundle from '~/clusters/clusters_bundle';
+import initClusterHealth from '~/pages/projects/clusters/show/cluster_health';
 
 document.addEventListener('DOMContentLoaded', () => {
   new ClustersBundle(); // eslint-disable-line no-new
+  initClusterHealth();
 });

ee/app/assets/javascripts/pages/projects/clusters/show/cluster_health.js → app/assets/javascripts/pages/projects/clusters/show/cluster_health.js

-import initCeBundle from '~/monitoring/monitoring_app';
+import monitoringApp from '~/monitoring/monitoring_app';
 
 export default () => {
   const el = document.getElementById('prometheus-graphs');
 
   if (el && el.dataset) {
-    initCeBundle({
+    monitoringApp({
       ...el.dataset,
       showLegend: false,
       showHeader: false,

app/assets/javascripts/pages/projects/clusters/show/index.js

 import ClustersBundle from '~/clusters/clusters_bundle';
 import initGkeNamespace from '~/create_cluster/gke_cluster_namespace';
+import initClusterHealth from './cluster_health';
 
 document.addEventListener('DOMContentLoaded', () => {
   new ClustersBundle(); // eslint-disable-line no-new
   initGkeNamespace();
+  initClusterHealth();
 });

app/views/clusters/clusters/show.html.haml

@@ -55,7 +55,7 @@
       %ul.nav-links.mobile-separator.nav.nav-tabs{ role: 'tablist' }
         = render 'details_tab'
         = render_if_exists 'clusters/clusters/environments_tab'
-        = render_if_exists 'clusters/clusters/health_tab'
+        = render 'clusters/clusters/health_tab'
         = render 'applications_tab'
         = render 'advanced_settings_tab'
 

ee/app/assets/javascripts/pages/admin/clusters/show/index.js

-import '~/pages/admin/clusters/show';
-import initClusterHealth from '../../../projects/clusters/show/cluster_health';
-
-document.addEventListener('DOMContentLoaded', initClusterHealth);

ee/app/assets/javascripts/pages/groups/clusters/show/index.js

-import '~/pages/projects/clusters/show';
-import initClusterHealth from '../../../projects/clusters/show/cluster_health';
-
-document.addEventListener('DOMContentLoaded', initClusterHealth);

ee/app/assets/javascripts/pages/projects/clusters/show/index.js

-import '~/pages/projects/clusters/show';
-import initClusterHealth from './cluster_health';
-
-document.addEventListener('DOMContentLoaded', initClusterHealth);