Use conductor API to bypass p2p syncing of unsafe head

[jinmel]

P2P gossip channel has undetermined latency for broadcasting unsafe head to the builders. Conductor API has an admin method to receive unsafe head via http request.

[dmarzzz]

on auth: "jwt auth, from what i recall there is not but should not be hard to add. if you dont want to modify the code there, you can think to wrap/unwrap via a simple reverse proxy. otoh its not hard to had there as well, just add the middleware and protect only that rpc method example. honestly id go with the nginx+sidecar approach."