Test downstream projects

Backports and extra changes to fix CI on 6.x branch #1901

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Run time

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Job	Run time
ipyparallel	4m 58s
ipywidgets	50s
jupyter_client	4m 55s
jupyter_kernel_test	34s
nbclient	2m 3s
qtconsole	1m 44s
spyder_kernels	1m 40s
downstream_check	2s
	16m 46s