pytest

89905381 - Fix passenv CI in tox ini and make tests insensitive to the presence of the CI env variable (#13684) (#13694)

Fix passenv CI in tox ini and make tests insensitive to the presence of the CI env variable (#13684) (#13694) As discussed in https://github.com/pytest-dev/pytest/pull/13684#:~:text=See%3A%20%23-,13679%20(comment),-ogrisel%20added%204. --------- (cherry picked from commit bf92debb4fd874289f6aed29c6947b611b1de0ae) Co-authored-by: Olivier Grisel <olivier.grisel@ensta.org> Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>