Test downstream projects

Backports and extra changes to fix CI on 6.x branch #1908

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Run time

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Job	Run time
nbclient	2m 2s
ipywidgets	42s
jupyter_client	6m 14s
ipyparallel	5m 30s
jupyter_kernel_test	34s
qtconsole	1m 55s
spyder_kernels	1m 53s
downstream_check	2s
	18m 52s