Test downstream projects

Remove unused ignores lints. #1685

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Run time

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Job	Run time
jupyter_client	5m 52s
ipywidgets	51s
jupyter_kernel_test	42s
ipyparallel	5m 37s
nbclient	1m 55s
qtconsole	2m 11s
spyder_kernels	1m 50s
	18m 58s