Pytest failure in main (after #388 was merged) and #418

[andrii-i]

Description

• Build CI workflow fails due to Pytest jupyter_scheduler/tests/test_job_files_manager.py:125 failure after changes in main (after Archiving all-files scheduler #388 was merged) and [1.x] Archiving scheduler, fix JFM tests #418.

Reproduce

See CI run : https://github.com/jupyter-server/jupyter-scheduler/actions/runs/5837424752/job/15832930590

[JasonWeill]

The underlying issue seems to be that when using the archiving scheduler, the "output" filenames are not used; the tarball contains files named with "staging" filenames. This does not cause a problem when run in production, but it breaks the tests. See #421 for a possible fix.