refactor: cleanup platform mocking #5692

Job	Run time
macos \| stable	38s
macos \| beta	55s
ubuntu \| stable	58s
ubuntu \| beta	40s
windows \| stable	1m 1s
windows \| beta	1m 20s
cancel-previous-workflow	2s
analyze / cancel-previous-workflow	3s
analyze / analyze	38s
analyze / package-analysis	1m 29s
	7m 44s

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