Merge requests should list the "addressed issues"

Description

Commits can refer to an issue via a commit message like this

Summary

Description

#1 #2 #5

If I afterwards create a merge Request for a branch containing such commits, I would like to see the addressed issues listed directly in the merge request's description.

I am pretty sure that I saw such a list in an earlier version of GitLab CE but it is apparently not present in the current one.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.

• Feature assurance
• Documentation
• Added to features.yml