Test model diagnostics using multiple AMPL SCIP versions #6185

Job	Run time
Check code formatting (Black)	29s
Compatibility tests	4m 42s
Check Spelling	10s
Pylint	4m 39s
pytest (py3.8/linux)	2m 34s
Build Sphinx docs	3m 49s
pytest (py3.8/win64)	8m 0s
pytest (py3.9/linux)	2m 23s
pytest (py3.9/win64)	9m 58s
pytest (py3.10/linux)	2m 24s
pytest (py3.10/win64)	9m 46s
pytest (py3.11/linux)	2m 55s
pytest (py3.11/win64)	9m 11s
pytest (py3.12/linux)	2m 1s
pytest (py3.12/win64)	7m 6s
Upload coverage report (Codecov)	0s
	1h 10m 7s

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