import_export: duplicate "by ... (imported from GitLab project)" mention in MR activity
Problem first raised in #25667 (closed).
I imported the project https://gitlab.com/victornoel/petals-cockpit (8.15.2-ee) into a docker instance of gitlab 8.15.2-ce.
I did it as an admin.
There is twice the sentence
By Victor Noël on 2016-11-25T08:53:46 (imported from GitLab project) in the milestone change.
Interestingly, the commits add does not have this problem.