C2(deploy-infra-alerting): impl exclude Job-owned pods from PodNotReady

CronJob pods (e.g., zim-watcher) are expected to complete and become
not-ready. Exclude them with `unless on (namespace, pod) kube_pod_owner{owner_kind="Job"}`.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

argocd/manifests/grafana/alerting.yaml

@@ -167,6 +167,8 @@ groups:
             model:
               expr: >-
                 kube_pod_status_ready{condition="true"} == 0
+                unless on (namespace, pod)
+                kube_pod_owner{owner_kind="Job"}
               interval: ""
               refId: A
           - refId: B