Investigate increasing the frequency of export file cleanup
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## Problem
Investigation into https://gitlab.com/gitlab-org/gitlab/-/issues/227700 showed that we keep export files around for at least 24 hours. This takes up a lot of space (see #2 https://gitlab.com/groups/gitlab-org/-/epics/3671#types-of-upload-storage-and-total-sizes) and ideally we'd try to reduce this footprint. We have at least a couple of options:
1. Decrease the amount of time that we keep export files available to download
2. Delete these files as soon as they have been downloaded the first time
## Goal
Determine if we can increase the frequency that we remove the export files generated for download.
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