Add a test for Mistral-NeMo. #4586

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	11m 51s
pytester (ubuntu-22.04, 3.10, latest, ops)	23m 39s
pytester (ubuntu-22.04, 3.10, nightly, core)	12m 37s
pytester (ubuntu-22.04, 3.10, nightly, ops)	24m 28s
pytester (macOS-14, 3.10, latest, core)	8m 25s
pytester (macOS-14, 3.10, latest, ops)	17m 9s
pytester (macOS-14, 3.10, nightly, core)	8m 1s
pytester (macOS-14, 3.10, nightly, ops)	18m 20s
pytester (windows-2022, 3.10, latest, core)	20m 36s
pytester (windows-2022, 3.10, nightly, core)	21m 52s
pytester (ubuntu-22.04, 3.11, latest)	20m 10s
pytester (ubuntu-22.04, 3.12, latest)	23m 41s
testing-guardian	1s
	3h 30m 50s

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