Dont merge alerts-endpoint to cluster health data

`alerts-endoint` key is calculated inside `ClusterablePresenter`

ee/app/views/clusters/clusters/_health.html.haml

 %section.settings.no-animate.expanded.cluster-health-graphs.qa-cluster-health-section#cluster-health
   - if @cluster&.application_prometheus_available?
-    #prometheus-graphs{ data: @cluster.health_data(clusterable).merge({ "alerts-endpoint" => ('/' if Feature.enabled?(:prometheus_computed_alerts)),
-    "prometheus-alerts-available" => ('true' if Feature.enabled?(:prometheus_computed_alerts)) }) }
+    #prometheus-graphs{ data: @cluster.health_data(clusterable) }
 
   - else
     %p.settings-message.text-center= s_("ClusterIntegration|In order to view the health of your cluster, you must first install Prometheus in the Applications tab.")