Fix the KAS Kubernetes detail dashboards
This reverts a change to the KAS metrics from !4335 (merged) that resulted in empty Kubernetes detail dashboards for KAS:
- https://dashboards.gitlab.net/d/kas-kube-deployments/kas-kube-deployment-detail
- https://dashboards.gitlab.net/d/kas-kube-containers/kas-kube-containers-detail
Snapshots:
- https://dashboards.gitlab.net/dashboard/snapshot/ZoYWQ14nomkD0wdJVe25ltNNAC9IqmLj - kas: Kube Containers Detail
- https://dashboards.gitlab.net/dashboard/snapshot/u5KjpvgVDRExUIe3knTWgz3yDaU2Qufk - kas: Kube Deployment Detail
cc/ @andrewn