feat: Add kubernetes version to status

[whiskeyjimbo]

info: this stacked off of #100 so when that is merged this will need to be synced.

since it adds extra logic to get the kubernetes version i figured it would be better off in a separate PR.

this PR adds a KubernetesVersion field to the VClusterStatus which is set from the client getting the server's version (git version) (which i think should distinguish between k8s/k3s/k0s(truthfully i havent tested k0s yet))

k get vcluster -n vcluster
NAME        VERSION   KUBERNETESVERSION   READY   PHASE      MESSAGE                                                                                                                                                            AGE
vcluster1   0.22.1    v1.31.1+k3s1        true    Deployed                                                                                                                                                                      3h
vcluster3   0.22.1    v1.32.0             true    Deployed                                                                                                                                                                      3h
vcluster4   0.22.1    v1.32.0             true    Deployed                                                                                                                                                                      3h
vcluster5   0.22.3    v1.32.0             true    Failed     error installing / upgrading vcluster: error executing helm upgrade: Error: chart "vcluster" version "0.22.33" not found in https://charts.loft.sh repository...   3h