Updated `excluded_model_families` data type #3297

Job	Run time
3.8 windows git-test-automl	35m 31s
3.8 windows git-test-modelunderstanding	22m 42s
3.8 windows git-test-other	15m 16s
3.8 windows git-test-parallel	12m 26s
3.8 windows git-test-prophet	19m 23s
	1h 45m 18s

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