[1.8.x] Refs #24652 -- Enforced test isolation in file_storage tests.
[1.8.x] Refs #24652 -- Enforced test isolation in file_storage tests.

Backport of 3db21c351b9b1108954c388799d35c8dad7dfc19 from master

h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,pquentin/django,pquentin/django,pquentin/django,h4r5h1t/django-hauthy