track output files #1719

Job	Run time
test-getting_started / tests	1m 51s
test-tutorials (configuration.ipynb) / tests	1m 28s
test-tutorials (debugging.ipynb) / tests	2m 9s
test-tutorials (describing_tasks.ipynb) / tests	2m 50s
test-tutorials (multiple_pilots.ipynb) / tests	2m 38s
test-tutorials (profiling.ipynb) / tests	1m 59s
test-tutorials (raptor.ipynb) / tests	2m 10s
test-tutorials (staging_data.ipynb) / tests	1m 55s
test-tutorials (raptor_mpi.ipynb) / tests	5m 6s
test-tutorials (submission.ipynb) / tests	1m 24s
	23m 30s

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