Tests

Add categoricals for `FractionalFactorialStrategy` #1424

Job	Run time
testing_tutorials (3.10)	19m 6s
testing (3.9)	9m 29s
testing_against_latest_botorch (3.10)	9m 39s
testing (3.11)	9m 46s
testing_data_models (3.9)	18s
testing_data_models (3.10)	19s
testing_data_models (3.11)	21s
	48m 58s

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