feat(k8s): create PoC for k3s in k8s

[nicklasfrahm]

This adds a very simple PoC to run a k3s server in another cluster as a managed controlplane. Open TODOs are:

• Further testing by adding agents as all pods are currently Pending.
• Adding a volume to persist the state of the k3s server.
• HA using cockroachdb.
• Reconfigure traefik and use Gateway API instead of IngressRouteTCP.

[github-actions]

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