If there is no waypoint, ztunnel will enforce RBAC policies against the request.

If all checks pass, ztunnel will open a connection to the target. This will spoof the source IP (from `Forwarded` for waypoints, or the incoming IP otherwise).

  // a single attach. When stdin is true the stdin stream will remain open across multiple attach
  // sessions. If stdinOnce is set to true, stdin is opened on container start, is empty until the
  // first client attaches to stdin, and then remains open and accepts data until the client disconnects,
  // at which time stdin is closed and remains closed until the container is restarted. If this