Tests

Add datetime test for ax.violin #29171

Job	Run time
Python 3.13 on ubuntu-22.04 (Extra TeX packages)	19m 55s
Python 3.11 on ubuntu-22.04 (Minimum Versions)	19m 37s
Python 3.12 on ubuntu-24.04	19m 18s
Python 3.11 on ubuntu-22.04	17m 27s
Python 3.13 on macos-14	13m 26s
Python 3.11 on macos-13	35m 23s
Python 3.12 on ubuntu-22.04-arm	11m 16s
Python 3.12 on macos-14	17m 13s
Python 3.13t on ubuntu-22.04 Free-threaded	18m 12s
Create issue on failure	0s
	2h 51m 47s

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