Downstream Tests

Update simple extension README to cd into correct subdirectory #2907

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Run time

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Job	Run time
jupyter_server_terminals	1m 30s
jupyterlab	1m 13s
jupyterlab_server	1m 36s
jupytext	2m 27s
nbclassic	2m 13s
notebook	1m 43s
downstream_check	4s
	10m 46s