Speed up pytest with parallelization

[mashehu]

Description of feature

pytest-xdist should do the job (just need to add -n auto). Tested it locally and throws errors because of git errors due to parallel actions (because we use the same git repo for the moduoles cache for test_modules, test_subworkflow, test_components.

One option would be be with --dist=loadgroup and grouping the different git operations together with @pytest.mark.xdist_group(name="group1")