test: use `Set.difference()` #59372

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Job	Run time
format-cpp	1m 27s
lint-addon-docs	30s
lint-cpp	1m 12s
lint-js-and-md	3m 17s
lint-yaml	31s
lint-codeowners	22s
lint-py	34s
lint-pr-url	23s
lint-readme	22s
lint-sh	22s
	9m 0s