refs #22170.

Moved contenttypes tests to allow them to run correctly in the presence of
migrations. refs #22170.

This inspects the migration operation, and if it is not in the
django.db.migrations module, it adds the relevant imports to the
migration writer and uses the correct class name.

refs #22170.

Without this, we're unable to add actual migrations for the app.

refs #22170.

refs #22170.

refs #22170.

Fixed #22842

Fixed #22826 -- Improved internal usage of Query.setup_joins.

Refs #22830. Thanks django@gfairchild.com for the suggestion.

Refs #19973.

Keeping backwards compatibility with test_runner.option_list is
tricky and would imply transforming an optparse.Option to an
argparse.Action. I choose to introduce a backwards incompatible
change because it only affects testing, not runtime behavior.

Thanks Tim Graham for the review.

and used it in the Oracle SchemaEditor. Refs #22715.