fix: use `get_model_def_script` method #7912

Job	Run time
Test Python (1, 3.8)	11m 31s
Test Python (1, 3.11)	9m 59s
Test Python (2, 3.8)	9m 0s
Test Python (2, 3.11)	9m 0s
Test Python (3, 3.8)	9m 34s
Test Python (3, 3.11)	9m 23s
Test Python (4, 3.8)	10m 9s
Test Python (4, 3.11)	9m 41s
Test Python (5, 3.8)	9m 59s
Test Python (5, 3.11)	9m 19s
Test Python (6, 3.8)	10m 47s
Test Python (6, 3.11)	9m 49s
Combine and update integration test durations (3.8)	4s
Combine and update integration test durations (3.11)	4s
Pass testing Python	2s
	1h 58m 21s

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