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* De-parallelize and increase verbosity of integration tests

* Hide output of some test

Otherwise Windows runners may raise this exception:

  E UnicodeEncodeError: 'charmap' codec can't encode characters in position 890-897: character maps to <undefined>

* Update test/pytest.ini
Co-authored-by: Umberto Baldi <34278123+umbynos@users.noreply.github.com>
Co-authored-by: Umberto Baldi <34278123+umbynos@users.noreply.github.com>