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Refs #33476 -- Applied Black's 2023 stable style.
Refs #33476 -- Reformatted code with Black.
Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField
Fixed #21302 -- Fixed unused imports and import *.
Fixed #34085 -- Made management commands don't use black for non-Python files.
Merged regressiontests and modeltests into the test root.
Refs #36936 - Adjusted tests to set PYTHON_COLORS environment variable.