Remove unused monitoring bundle file

The monitoring_bundle_with_alerts was a quick fix for migrating custom
metrics to CE, this is file is not needed anymore.

app/assets/javascripts/monitoring/monitoring_bundle.js

@@ -22,6 +22,8 @@ export default (props = {}) => {
           props: {
             ...el.dataset,
             currentDashboard,
+            customMetricsAvailable: parseBoolean(el.dataset.customMetricsAvailable),
+            prometheusAlertsAvailable: parseBoolean(el.dataset.prometheusAlertsAvailable),
             hasMetrics: parseBoolean(el.dataset.hasMetrics),
             ...props,
           },

app/assets/javascripts/monitoring/monitoring_bundle_with_alerts.js

-import { parseBoolean } from '~/lib/utils/common_utils';
-import initCeBundle from '~/monitoring/monitoring_bundle';
-
-export default () => {
-  const el = document.getElementById('prometheus-graphs');
-
-  if (el && el.dataset) {
-    initCeBundle({
-      customMetricsAvailable: parseBoolean(el.dataset.customMetricsAvailable),
-      prometheusAlertsAvailable: parseBoolean(el.dataset.prometheusAlertsAvailable),
-    });
-  }
-};

app/assets/javascripts/pages/projects/environments/metrics/index.js

-import monitoringBundle from '~/monitoring/monitoring_bundle_with_alerts';
+import monitoringBundle from '~/monitoring/monitoring_bundle';
 
 document.addEventListener('DOMContentLoaded', monitoringBundle);