feat: add `get_model` classmethod to `BaseModel` #8531

Job	Run time
Test Python (1, 3.8)	28m 30s
Test Python (1, 3.11)	22m 53s
Test Python (2, 3.8)	24m 35s
Test Python (2, 3.11)	23m 20s
Test Python (3, 3.8)	24m 15s
Test Python (3, 3.11)	23m 25s
Test Python (4, 3.8)	24m 20s
Test Python (4, 3.11)	23m 35s
Test Python (5, 3.8)	25m 7s
Test Python (5, 3.11)	24m 7s
Test Python (6, 3.8)	25m 55s
Test Python (6, 3.11)	23m 54s
Combine and update integration test durations (3.8)	48s
Combine and update integration test durations (3.11)	47s
Pass testing Python	2s
	4h 55m 33s

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