Tests

Add support for Greybox model DOF counitng in degrees_of_freedom function #7214

Job	Run time
Compatibility tests	4m 35s
Check code formatting (Black)	31s
Check Spelling	9s
Pylint	4m 18s
Build Sphinx docs	5m 49s
pytest (py3.9/linux)	21m 25s
pytest (py3.9/win64)	34m 15s
pytest (py3.10/linux)	13m 58s
pytest (py3.10/win64)	36m 36s
pytest (py3.11/linux)	19m 46s
pytest (py3.11/win64)	39m 58s
pytest (py3.12/linux)	12m 30s
pytest (py3.12/win64)	35m 56s
Upload coverage report (Codecov) (linux)	13s
Upload coverage report (Codecov) (win64)	9s
	3h 50m 8s

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