Resolve "GitLab sshd should include data transfer bytes in logs"

This MR extends !783 (merged) by also including the written_bytes field, e.g.:

{
  "correlation_id": "01H97CH38VN3TWCSXRZ7DM5SMZ",
  "duration_s": 0.302332792,
  "level": "info",
  "meta": {
    "project": "flightjs/Flight",
    "root_namespace": "flightjs"
  },
  "msg": "access: finish",
  "remote_addr": "172.16.123.1:52856",
  "time": "2023-09-01T03:28:01Z",
  "written_bytes": 680002
}

Closes #648 (closed)