Use static user in user messages export for better performance
Use static user in user messages export for better performance
This was the strategy no longer needs to go out and lookup the user for each message (reduce touches to the database)
Part of https://gitlab.com/gitlab-org/gitter/webapp/-/issues/1899
Context https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1941#note_384095181