Remove obsolete button class

app/assets/javascripts/clusters/clusters_bundle.js

@@ -237,7 +237,7 @@ export default class Clusters {
   }
 
   addBannerCloseHandler(el, status) {
-    el.querySelector('.js-close-banner').addEventListener('click', () => {
+    el.querySelector('.js-close').addEventListener('click', () => {
       el.classList.add('hidden');
       this.setBannerDismissedState(status, true);
     });

app/views/clusters/clusters/_banner.html.haml

@@ -8,14 +8,14 @@
 
 .hidden.row.js-cluster-api-unreachable.gl-alert.gl-alert-warning{ role: 'alert' }
   = sprite_icon('warning', css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
-  %button.js-close-banner.gl-alert-dismiss{ type: 'button', 'aria-label' => _('Dismiss') }
+  %button.js-close.gl-alert-dismiss{ type: 'button', 'aria-label' => _('Dismiss') }
     = sprite_icon('close', css_class: 'gl-icon')
   .gl-alert-body
     = s_('ClusterIntegration|Your cluster API is unreachable. Please ensure your API URL is correct.')
 
 .hidden.js-cluster-authentication-failure.js-cluster-api-unreachable.gl-alert.gl-alert-warning{ role: 'alert' }
   = sprite_icon('warning', css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
-  %button.js-close-banner.gl-alert-dismiss{ type: 'button', 'aria-label' => _('Dismiss') }
+  %button.js-close.gl-alert-dismiss{ type: 'button', 'aria-label' => _('Dismiss') }
     = sprite_icon('close', css_class: 'gl-icon')
   .gl-alert-body
     = s_('ClusterIntegration|There was a problem authenticating with your cluster. Please ensure your CA Certificate and Token are valid.')