Split CI into OS-specific workflows #3

Job	Run time
windows-coverage-stable / coverage	1m 44s
windows-lint-all-stable / lint	2m 36s
windows-build-and-test-stable (1.63) / build-and-test	1m 3s
windows-build-and-test-stable (beta) / build-and-test	1m 0s
windows-build-and-test-stable (stable) / build-and-test	1m 5s
	7m 28s

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