Test downstream projects

Improve robustness of subshell concurrency tests using Barrier (#1288) #1450

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Run time

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Job	Run time
ipyparallel	20m 13s
ipywidgets	42s
jupyter_client	5m 28s
jupyter_kernel_test	42s
nbclient	2m 9s
spyder_kernels	1m 58s
qtconsole	1m 53s
downstream_check	2s
	33m 7s