Test collection failing when building wheels

[JukkaL]

See https://github.com/mypyc/mypy_mypyc-wheels/actions, e.g. https://github.com/mypyc/mypy_mypyc-wheels/actions/runs/2695060465.

Test output:

____________ ERROR collecting site-packages/mypy/test/testcheck.py _____________
  site-packages/mypy/test/testcheck.py:42: in <module>
      typecheck_files.remove('check-python310.test')
  E   ValueError: list.remove(x): x not in list
  ____________ ERROR collecting site-packages/mypy/test/testcheck.py _____________
  site-packages/mypy/test/testcheck.py:42: in <module>
      typecheck_files.remove('check-python310.test')
  E   ValueError: list.remove(x): x not in list
  ____________ ERROR collecting site-packages/mypy/test/testcheck.py _____________
  site-packages/mypy/test/testcheck.py:42: in <module>
      typecheck_files.remove('check-python310.test')
  E   ValueError: list.remove(x): x not in list
  ____________ ERROR collecting site-packages/mypy/test/testparse.py _____________
  site-packages/mypy/test/testparse.py:15: in <module>
      class ParserSuite(DataSuite):
  site-packages/mypy/test/testparse.py:21: in ParserSuite
      files.remove('parse-python310.test')
  E   ValueError: list.remove(x): x not in list
  ____________ ERROR collecting site-packages/mypy/test/testparse.py _____________
  site-packages/mypy/test/testparse.py:15: in <module>
      class ParserSuite(DataSuite):
  site-packages/mypy/test/testparse.py:21: in ParserSuite
      files.remove('parse-python310.test')
  E   ValueError: list.remove(x): x not in list
  ____________ ERROR collecting site-packages/mypy/test/testparse.py _____________
  site-packages/mypy/test/testparse.py:15: in <module>
      class ParserSuite(DataSuite):
  site-packages/mypy/test/testparse.py:21: in ParserSuite
      files.remove('parse-python310.test')
  E   ValueError: list.remove(x): x not in list
  ___________ ERROR collecting site-packages/mypy/test/testsemanal.py ____________
  site-packages/mypy/test/testsemanal.py:37: in <module>
      semanal_files.remove('semanal-python310.test')
  E   ValueError: list.remove(x): x not in list
  ___________ ERROR collecting site-packages/mypy/test/testsemanal.py ____________
  site-packages/mypy/test/testsemanal.py:37: in <module>
      semanal_files.remove('semanal-python310.test')
  E   ValueError: list.remove(x): x not in list
  ___________ ERROR collecting site-packages/mypy/test/testsemanal.py ____________
  site-packages/mypy/test/testsemanal.py:37: in <module>
      semanal_files.remove('semanal-python310.test')
  E   ValueError: list.remove(x): x not in list

This was caused by #13143.