Run build & test steps on windows & macos if the ci/test label is set #486

Job	Run time
setup_matrix	1s
integration-tests (ubuntu-latest, 6.0.x)	9m 49s
integration-tests (ubuntu-latest, 8.0.x)	9m 48s
integration-tests (windows-latest, 6.0.x)	19m 1s
integration-tests (windows-latest, 8.0.x)	18m 54s
integration-tests (macos-11, 6.0.x)	27m 48s
integration-tests (macos-11, 8.0.x)	25m 31s
debug	1s
check-pr	0s
	1h 50m 53s

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