Add diagnostics tests for all unit models #6246

Job	Run time
Check code formatting (Black)	32s
Compatibility tests	5m 23s
Check Spelling	9s
Build Sphinx docs	5m 43s
Pylint	5m 23s
pytest (py3.8/linux)	19m 7s
pytest (py3.8/win64)	36m 8s
pytest (py3.9/linux)	19m 13s
pytest (py3.9/win64)	33m 6s
pytest (py3.10/linux)	18m 54s
pytest (py3.10/win64)	35m 21s
pytest (py3.11/linux)	25m 33s
pytest (py3.11/win64)	47m 10s
pytest (py3.12/linux)	14m 54s
pytest (py3.12/win64)	29m 26s
Upload coverage report (Codecov) (linux)	10s
Upload coverage report (Codecov) (win64)	9s
	4h 56m 21s

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