[3.12] gh-116307: Proper fix for 'mod' leaking across importlib tests (GH-116680) #116684
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(cherry picked from commit a254807)
Co-authored-by: Jason R. Coombs jaraco@jaraco.com
gh-116307: Create a new import helper 'isolated modules' and use that instead of 'Clean Import' to ensure that tests from importlib_resources don't leave modules in sys.modules.