Run subprocess-starting tests in a separate xdist loadgroup #30267
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I suspect that we are running out of process IDs, or the scheduler is not letting all subprocesses execute, leading to timeouts in tests that start subprocesses when other long-running tests are executing. This happens often with Python 3.14 tests for some reason. Put the tests that start a subprocess in a separate loadgroup so that no two of them get executed in parallel. Alternative to matplotlib#30264.
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I suspect that we are running out of process IDs, or the scheduler
is not letting all subprocesses execute, leading to timeouts in
tests that start subprocesses when other long-running tests are
executing. This happens often with Python 3.14 tests for some reason.
Put the tests that start a subprocess in a separate loadgroup
so that no two of them get executed in parallel.
Alternative to #30264.