CI: Remove the pytest-xdist plugin from the "Tests" and "Dev Tests" workflows #3627
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The macOS CI jobs recently started failing, as originally reported in #3601 (comment). After investigating, I identified commit f91475d as the first commit causing the issue. However, reverting this commit alone does not fully resolve the failures, as subsequent commits related to testing the
_to_numpy
function also contribute to the problem.The exact reason why commit f91475d triggers these failures (on macOS only) remains unclear. However, removing the
pytest-xdist
plugin, which runs tests across multiple processes, resolves the failures, allowing the CI jobs to pass successfully again.The downside of this fix is that removing
pytest-xdist
increases the CI runtime, as tests now run sequentially instead of in parallel. While this trade-off impacts efficiency, it ensures stability for the macOS CI jobs.