Add command to support SSH to Node

Step required to SSH onto nodes (PKE cluster):
- Download the SSH secret (id_rsa)
- Grab the Node IP (public ip or via jump host)
- ~Parameter SSH command~ *generate ssh config file* with the private key and host (+ optionally ProxyJump)

Start by locating the CLI command definitions and the existing PKE cluster, node IP, and SSH secret handling. Trace how a node and optional jump host are selected, then define the command's expected SSH config output and verify it supports both direct access and ProxyJump.

Written by the indexing model from the issue text.