TST: don't use global fixture in the base extension tests #38494
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Follow-up on #37867. In the discussion about using this fixture, I forgot that we should not use global pandas fixtures in those tests, but only the ones that are defined in the local /pandas/tests/extension/conftest.py, otherwise this doesn't work for downstream projects (eg geopandas/geopandas#1735). For this case it's easier to simply not use a fixture, I think (but still share the common definition of the list)