feat: Distinguish server type via automatic label

[lukasmetzner]

This update to the HCCM introduces a new label for Kubernetes nodes: instance.hetzner.cloud/provided-by. This label will be automatically applied to nodes, indicating their origin as either:

• robot for dedicated servers
• cloud for cloud-based virtual machines

With this features other components (e.g. csi-driver) can fine-tune their deployment requirements.