Run build & test steps on windows & macos if the ci/test label is set #488

Job	Run time
setup_matrix	1s
integration-tests (ubuntu-latest, 6.0.x)	9m 42s
integration-tests (ubuntu-latest, 8.0.x)	10m 32s
integration-tests (windows-latest, 6.0.x)	26m 47s
integration-tests (windows-latest, 8.0.x)	16m 9s
integration-tests (macos-11, 6.0.x)	26m 29s
integration-tests (macos-11, 8.0.x)	26m 18s
debug	1s
check-pr	0s
	1h 55m 59s

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