🐛 [#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

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

• Release management

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

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

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

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

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