Test downstream projects

Use `threading.Event` for `_eventloop_set` instead of `anyio.Event` #1456

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Run time

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Job	Run time
jupyter_kernel_test	33s
ipywidgets	43s
ipyparallel	2m 49s
jupyter_client	2m 49s
nbclient	1m 54s
qtconsole	1m 35s
spyder_kernels	1m 39s
downstream_check	1s
	12m 3s