install & check source distributions before wheels #29930

Job	Run time
code-quality	1m 28s
build packages	41s
integration test / python 3.7 / ubuntu-20.04	9m 20s
unit test / python 3.7	1m 31s
integration test / python 3.8 / ubuntu-20.04	10m 17s
integration test / python 3.9 / ubuntu-20.04	10m 19s
unit test / python 3.8	1m 34s
integration test / python 3.10 / ubuntu-20.04	10m 31s
unit test / python 3.9	1m 23s
integration test / python 3.8 / windows-latest	15m 28s
integration test / python 3.8 / macos-12	13m 5s
unit test / python 3.10	1m 25s
	1h 17m 2s

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