Test downstream projects

Ignore or fix most of the remaining ruff 0.9.6 errors #1619

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Run time

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Job	Run time
ipyparallel	5m 30s
ipywidgets	45s
jupyter_client	5m 24s
jupyter_kernel_test	37s
nbclient	2m 7s
qtconsole	1m 34s
spyder_kernels	17s
downstream_check	3s
	16m 17s