refactor: cleanup platform mocking #5726

Job	Run time
macos \| stable	49s
macos \| beta	39s
cancel-previous-workflow	3s
ubuntu \| stable	1m 3s
ubuntu \| beta	34s
windows \| stable	1m 22s
windows \| beta	1m 7s
analyze / analyze	39s
analyze / cancel-previous-workflow	3s
analyze / package-analysis	1m 33s
	7m 52s

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