Fix conflicting PrometheusRules

Author: ArthurSens

operations/observability/mixins/meta/rules/public-api.yaml

@@ -4,7 +4,7 @@ metadata:
   labels:
     prometheus: k8s
     role: alert-rules
-  name: server-monitoring-rules
+  name: public-api-monitoring-rules
 spec:
   groups:
   - name: public-api