Tests

Variable length columns for CTable #3404

Job	Run time
Build and test on macos-latest (python 3.12)	12m 12s
Build and test on ubuntu-latest (numpy 1.26)	12m 15s
Build and test on ubuntu-latest (python 3.12)	13m 26s
Build and test on ubuntu-latest (python 3.14)	13m 38s
Build and test on windows-latest (python 3.12)	18m 43s
	1h 10m 14s

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