Add running doctest to pytest default (#7840)

* Add default options for pytest

* updating DIRECTORY.md

* Move pytest settings to pyproject.toml

* Move coverage settings to the pyproject.toml

* Return --doctest-continue-on-failure to pytest

* Convert pytest args to list

* Update pyproject.toml

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>