[3.14] gh-140702: Log color and GHA env vars in test.pythoninfo (GH-140747) (#140753)

gh-140702: Log color and GHA env vars in test.pythoninfo (GH-140747)
(cherry picked from commit 376559bf54762d7b6e0a14591a1f284c8f09a855)

Co-authored-by: Victor Stinner <vstinner@python.org>