If we know who's providing submission approval, capture it in the approval docevent

`type_defect`   |    by rjsparks@nostrum.com

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See https://trac.ietf.org/trac/ietfdb/browser/trunk/ietf/submit/utils.py#L333. We drop an event by=(System) for document approval, and then attribute the new version posted to by=request.user.

Both should be request.user


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_Issue migrated from trac:3545 at 2022-03-04 09:27:59 +0000_