Werk #13800: KUBE: update section name kube_collectors_metadata_v1

This change affects users whom used the Check API to write their own Kubernetes check. The name of the section kube_collectors_metadata_v1, resp. parsed section name kube_collectors_metadata, has been changed to kube_collector_metadata_v1, resp. kube_collector_metatdata. They are now in line with the documentation.

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