Describe the solution you'd like
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We need to make credentials part of the ProxmoxCluster CR so we can enable supporting many proxmox clusters

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

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