More efficient method for check_parallel_jacobian #7064

Job	Run time
Compatibility tests	4m 24s
Check Spelling	6s
Check code formatting (Black)	30s
Pylint	4m 19s
pytest (py3.9/linux)	19m 49s
Build Sphinx docs	5m 22s
pytest (py3.9/win64)	27m 3s
pytest (py3.10/linux)	13m 53s
pytest (py3.10/win64)	30m 56s
pytest (py3.11/linux)	19m 38s
pytest (py3.11/win64)	40m 16s
pytest (py3.12/linux)	12m 12s
pytest (py3.12/win64)	30m 44s
Upload coverage report (Codecov) (linux)	9s
Upload coverage report (Codecov) (win64)	9s
	3h 29m 30s

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