Cluster initialization post initialization commands.

[DeprecatedLuke]

It would be great if there was a way to run post-install kubectl commands using the generated kubeconfig. Currently it can be performed with an external script so the priority for this is low.

Although it would be nice if it was possible to have a configuration option:

post_initialization_kubectl_commands:
- create -f https://raw.githubusercontent.com/projectcalico/calico/v3.28.0/manifests/tigera-operator.yaml

This would streamline any kind of post-initialization logic for the cluster itself rather than any particular node.

I would be happy to create a pull request for this if this is something that sounds like a good idea and others are interested in it.