C2(deploy-infra-alerting): impl fix PodNotReady noDataState to OK

No unhealthy pods = no query results = noData state. With noDataState
set to NoData, Grafana fires an alert with empty labels ("Pod in is
not ready"). Change to OK since no results means everything is healthy.

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

argocd/manifests/grafana/alerting.yaml

@@ -150,7 +150,7 @@ groups:
         title: PodNotReady
         condition: C
         for: 5m
-        noDataState: NoData
+        noDataState: OK
         execErrState: Alerting
         annotations:
           summary: >-