trackbone-wrapper: check if nix-shell deps are up to date

This is used to know if you are running trackbone inside an old nix-shell (compared to where the current envs-ng HEAD is).

trackbone-wrapper will exit if one of the following dependency is not in sync between nix-shell env & current git checkout:

• trackbone
• caascad-zones
• scripts (bastion-tunnel, k8s-access, wrapper)
• shell.nix
• default.nix