Describe the issue

When a submission is cancelled, it is intended that all of its artifacts will be removed. This is not done correctly now. The code in ietf.submit.utils.remove_staging_files() is called with the list of extensions in submission.file_types and only these files are removed. However, this list only includes files that the submitter uploaded - any files generated by datatracker are left over. This often includes .txt and I think always includes .html.

This will likely be OBE if #4334 is resolved in a way that directly links submission artifacts to the Submission object.

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