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After introducing flatcar and ignition #308 , which also uses the NetworkConfigData struct to generate the networkd config.
It doesn't make sense to keep it in the cloudinit pkg.

Anything else you would like to add:
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move NetworkConfigData type to it's own pkg

Environment:

• Cluster-api-provider-proxmox version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):