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 (closed) 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.