gh-108696: revert bypassing import cache in test_import helper #108698
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Per suggestion from @FFY00 on #104186, let's revert this change to get the refleak buildbots green again.
Verified that with this diff,
./python -m test -R: -v test_import
no longer leaks references.It seems that if we want to bypass this cache, it will require a bit more work to ensure we always dispose of the freshly-imported modules.