No chia up --add when using Tailscale

[urd00m]

In chia/cluster/node_setup.py:180|node_setup.py:180, users are prevented from calling chia up --add when using tailnet mode.

It seems in Tailscale mode when workers are added to the cluster, various ports and addresses will be updated which is problematic.

[jack2bs]

The primary implementation detail here I think is that for tailscale a relay script is used which must be generated based on what exists in the cluster so all of the relay scripts must be regenerated, replaced, and restarted on each worker.