[2.2.0] Checkmk Werk 16757 created: agent_kube: resolve case when referenced PVC is no longer present

Title: agent_kube: resolve case when referenced PVC is no longer present Class: fix Compatible: compat Component: checks Date: 1714992435 Edition: cre Level: 1 Version: 2.2.0p27 Prior to this werk, the Kubernetes special agent failed whenever the API returned Kubernetes objects with at least one reference to a no longer existing PVC. This werk fixes this issue by ignoring such references.