:bug: [#4763] Allow temporary file uploads to be deleted

[robinmolen]

Closes #4763

Changes

Temporary file uploads can now be deleted, solving the deletion issue of form submissions with file uploads

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [X] Checked copying a form
  • [X] Checked import/export of a form
  • [X] Config checks in the configuration overview admin page
  • [X] Problem detection in the admin email digest is handled

• Release management

  • [X] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [X] Ran ./bin/makemessages_js.sh
  • [X] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [X] Commit messages refer to the relevant Github issue
  • [X] Commit messages explain the "why" of change, not the how

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (master@8f11d28). Learn more about missing BASE report. Report is 19 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4805 +/- ## ========================================= Coverage ? 96.56% ========================================= Files ? 748 Lines ? 25409 Branches ? 3357 ========================================= Hits ? 24535 Misses ? 609 Partials ? 265 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.