calicoctl node diags is still using obsolete 'netstat' tool instead of 'ss' #5258

Expected Behavior

Example from https://docs.projectcalico.org/reference/calicoctl/node/diags

$ sudo calicoctl node diags
Collecting diagnostics
Using temp dir: /tmp/calico676127473
Dumping netstat
Dumping routes (IPv4)
Dumping routes (IPv6)
[...]

Current Behavior

socket information is not collected as netstat tool is obsolete and removed in Ubuntu and other distros.

gosekar@gosekar-k8s-master:~$ sudo calicoctl node diags
Collecting diagnostics
Using temp dir: /tmp/calico662105980
Dumping netstat
Failed to run command: netstat -a -n
Error: 
Dumping routes (IPv4)
Dumping routes (IPv6)
[...]

Possible Solution

ss -an should be run if netstat -a -n fails
https://github.com/projectcalico/calicoctl/blob/9e38edf150db3044f81c2a0ccaaca3125c04056c/calicoctl/commands/node/diags.go#L91

Steps to Reproduce (for bugs)

Run calicoctl node diags in latest distros

Context

Trying to simulate log collection for troubleshooting kubernetes+calico environment

Your Environment

• calicoctl version (e.g. calicoctl version):

gosekar@gosekar-k8s-master:~$ calicoctl version
Client Version:    v3.20.0
Git commit:        38b00edd
Cluster Version:   v3.20.0
Cluster Type:      k8s,bgp,kubeadm,kdd

• calico/node version (e.g. docker run --rm calico/node versions)

gosekar@gosekar-k8s-master:~$ kubectl exec -it calico-node-l6tng -n kube-system -- /bin/calico-node -v
v3.20.0

• Orchestrator type and version (e.g. kubernetes, mesos, rkt):
  Kubernetes 1.22.1
• Operating System and version:
  Ubuntu 20.04.3 5.4.0-81-generic
• Link to your project (optional): Nil