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Fixed #35660 -- Made serialized_rollback and fixture data available in TransactionTestCase.setUpClass().
Fixed #36589 -- Made assertTemplateUsed/NotUsed track full path for PartialTemplate.
Merged regressiontests and modeltests into the test root.
Refs #33476 -- Reformatted code with Black.
Refs #36936 - Adjusted tests to set PYTHON_COLORS environment variable.
Added various missing test skips observed on MongoDB.
Fixed #36859 -- Made assertContains and assertNotContains idempotent for streaming responses.
Removed default empty content argument from HttpResponse calls.