Updated `excluded_model_families` data type #3298

Job	Run time
3.8 unit git-test-automl tests	25m 50s
3.8 unit git-test-prophet tests	7m 50s
3.8 unit git-test-modelunderstanding tests	11m 31s
3.8 unit git-test-other tests	10m 25s
3.8 unit git-test-parallel tests	5m 43s
	1h 1m 19s

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