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.

It's upgraded to the same version deployed in the rancher aks cluster.
The CRD will be manually deployed

Related to swh/infra/sysadm-environment#5036
Related to swh/infra/sysadm-environment#5281

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

@@ -10,7 +10,7 @@ spec:
   source:
     chart: kube-prometheus-stack
     repoURL: https://prometheus-community.github.io/helm-charts
-    targetRevision: 43.1.0
+    targetRevision: 45.10.1
     helm:
       releaseName: gitlab-staging-prometheus # must match the application name (https://github.com/argoproj/argo-cd/issues/2871)
       # The crds must be manually applied to avoid the following error:
@@ -21,13 +21,10 @@ spec:
       skipCrds: true
       values: |
         alertmanager:
-          enabled: true  # Temporary for tests
-        defaultRules:
-          rules:
-            kubeControllerManager: false
-            kubeProxy: false
-            kubeSchedulerRecording: false
-            kubeStateMetrics: false
+          enabled: true
+          alertmanagerSpec:
+            alertmanagerConfigMatcherStrategy:
+              type: None
         grafana:
           enabled: true  # Temporary before federation with pergamon
           service: