stop_gradient for nlist #3257

Job	Run time
Test Python (1, 3.9)	27m 46s
Test Python (1, 3.12)	30m 6s
Test Python (2, 3.9)	27m 55s
Test Python (2, 3.12)	32m 31s
Test Python (3, 3.9)	27m 5s
Test Python (3, 3.12)	33m 25s
Test Python (4, 3.9)	27m 39s
Test Python (4, 3.12)	32m 41s
Test Python (5, 3.9)	28m 3s
Test Python (5, 3.12)	33m 19s
Test Python (6, 3.9)	27m 3s
Test Python (6, 3.12)	33m 31s
Combine and update integration test durations (3.9)	36s
Combine and update integration test durations (3.12)	1m 8s
Pass testing Python	1s
	6h 2m 49s

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