Rename ServiceMonitors to not get deleted by operator

We create our own ServiceMonitor resources, since the argocd-operator
doesn't support creating ServiceMonitors without also deploying a
Prometheus instance.

However, the operator will delete any ServiceMonitor which matches the
name that it would generate for its managed ServiceMonitors if the
Prometheus component is disabled, cf.
https://github.com/argoproj-labs/argocd-operator/blob/17064c9b310785ab145747a367f7deb5507a572e/controllers/argocd/prometheus.go#L129-L136

This causes the component-managed ServiceMonitors to get deleted from
time to time, and they get recreated after a while by an ArgoCD resync.

This commit circumvents the issue by renaming the component-managed
ServiceMonitors so they don't get deleted by the operator.

component/monitoring.libsonnet

@@ -104,8 +104,10 @@ local promEnable = function(obj)
 ;
 
 [
-  promEnable(serviceMonitor('syn-argocd-metrics')),
-  promEnable(serviceMonitor('syn-argocd-server-metrics')),
-  promEnable(serviceMonitor('syn-argocd-repo-server')),
+  // We explicitly select names for the service monitors which don't match the
+  // operator-generated names for instance syn-argocd
+  promEnable(serviceMonitor('syn-component-argocd-metrics')),
+  promEnable(serviceMonitor('syn-component-argocd-server-metrics')),
+  promEnable(serviceMonitor('syn-component-argocd-repo-server')),
   promEnable(alert_rules),
 ] + if params.monitoring.dashboards then [ grafana_dashboard ] else []