add developing doc #3173

Job	Run time
Test Python (1, 3.9)	34m 34s
Test Python (1, 3.12)	38m 44s
Test Python (2, 3.9)	29m 49s
Test Python (2, 3.12)	38m 10s
Test Python (3, 3.9)	29m 9s
Test Python (3, 3.12)	39m 16s
Test Python (4, 3.9)	29m 9s
Test Python (4, 3.12)	39m 8s
Test Python (5, 3.9)	30m 54s
Test Python (5, 3.12)	39m 36s
Test Python (6, 3.9)	29m 55s
Test Python (6, 3.12)	39m 21s
Combine and update integration test durations (3.9)	24s
Combine and update integration test durations (3.12)	54s
Pass testing Python	4s
	6h 59m 7s

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