Test downstream projects

Use `threading.Event` for `_eventloop_set` instead of `anyio.Event` #1457

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Run time

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Job	Run time
jupyter_client	5m 16s
ipyparallel	5m 42s
ipywidgets	49s
jupyter_kernel_test	30s
nbclient	2m 0s
qtconsole	1m 26s
spyder_kernels	1m 30s
downstream_check	1s
	17m 14s