Test downstream projects

Backports and extra changes to fix CI on 6.x branch #1907

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Run time

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Job	Run time
nbclient	3m 0s
ipyparallel	3m 29s
jupyter_client	3m 30s
ipywidgets	41s
jupyter_kernel_test	32s
qtconsole	1m 57s
spyder_kernels	1m 49s
downstream_check	2s
	15m 0s