Add support for User Namespaces feature
There is a new Kubernetes feature (which is alpha in 1.25 at the moment) which we will want to have support for when it gets to stable: [User Namespaces](https://kubernetes.io/docs/concepts/workloads/pods/user-namespaces/). There is a customer interest in it as well. Check out [this internal support ticket](https://gitlab.zendesk.com/agent/tickets/372666).
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