Add Hessian check for 2-parameter problems #1713

Job	Run time
style	24s
Coverage tests (macos-14 / Python 3.12)	7m 39s
Integration tests (ubuntu-latest / Python 3.12)	7m 40s
Test examples (ubuntu-latest / Python 3.12)	22m 3s
Integration tests (windows-latest / Python 3.12)	8m 28s
Test examples (windows-latest / Python 3.12)	20m 37s
Unit tests (ubuntu-latest / Python 3.9)	1m 5s
Integration tests (macos-13 / Python 3.12)	7m 53s
Test examples (macos-13 / Python 3.12)	24m 40s
Integration tests (macos-14 / Python 3.12)	3m 59s
Test examples (macos-14 / Python 3.12)	9m 51s
Unit tests (ubuntu-latest / Python 3.10)	1m 19s
Unit tests (ubuntu-latest / Python 3.11)	1m 4s
Unit tests (ubuntu-latest / Python 3.12)	1m 17s
Unit tests (windows-latest / Python 3.9)	2m 17s
Unit tests (windows-latest / Python 3.10)	3m 39s
Unit tests (windows-latest / Python 3.11)	4m 8s
Unit tests (windows-latest / Python 3.12)	4m 12s
Unit tests (macos-13 / Python 3.9)	3m 8s
Unit tests (macos-13 / Python 3.10)	1m 40s
Unit tests (macos-13 / Python 3.11)	1m 49s
Unit tests (macos-13 / Python 3.12)	1m 38s
Unit tests (macos-14 / Python 3.9)	1m 13s
Unit tests (macos-14 / Python 3.10)	1m 0s
Unit tests (macos-14 / Python 3.11)	57s
	2h 23m 40s

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