chore: use standard lib testing environment detection (#1631) #590

Job	Run time
staticcheck	2m 41s
test (1.23.x, macos-latest)	2m 59s
test (1.23.x, windows-latest)	4m 56s
test (1.23.x, ubuntu-latest-128)	21m 22s
slack-notifications / notify_slack	3s
	32m 1s

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