Draft: gitlab-staging: Remove the namespace alert filtering

The prometheus operator and the helm chart need to be upgraded to add the option to disable the namespace filtering

Related to swh/infra/sysadm-environment#5036 (closed) Related to swh/infra/sysadm-environment#5281 (closed)

argocd-configuration/applications/gitlab-staging/prometheus-application.yaml

@@ -25,12 +25,6 @@ spec:
           alertmanagerSpec:
             alertmanagerConfigMatcherStrategy:
               type: None
-        defaultRules:
-          rules:
-            kubeControllerManager: false
-            kubeProxy: false
-            kubeSchedulerRecording: false
-            kubeStateMetrics: false
         grafana:
           enabled: true  # Temporary before federation with pergamon
           service: