Detect conditions when workers need to be restarted or re-joined

As mentioned by @twz123 in https://github.com/k0sproject/k0sctl/issues/721#issuecomment-2137655712 - there are situations that could be consistently detected by k0sctl that require that the existing workers are restarted / reconfigured / rejoined.

This is something k0sctl should handle gracefully.
