The NOTE shown when an explicit login isn't provided is output on Stdout
instead of Stderr. This messes up the output of any commands when piping
them to a tool such as `yq`. Move this human readable information to
Stderr so it doesn't break any automated parsing.
Reviewed-on: https://gitea.com/gitea/tea/pulls/636
Co-authored-by: Jake Hillion <jake@hillion.co.uk>
Co-committed-by: Jake Hillion <jake@hillion.co.uk>
493b29afbf