[3.13] gh-128595: Default to stdout isatty for colour detection instead of stderr (GH-128498) (#129057)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Fix `test__colorize` unexpected keyword argument 'file' on buildbots (#129070)