I don't have to manually re-add the Tuleap Reference

The payload sent by MR creation looks like:

"object_attributes": {
    "id": 99,
    "target_branch": "master",
    "source_branch": "ms-viewport",
    ...
}

So when source_branch contains a pattern like TULEAP-XXX (case insensitive):

• A gitlab_mr cross reference is created on XXX artifact
• Tuleap bot creates a backlink to tuleap artifact in MR comments

Note: those actions are the same than the one for story #17182, if the MR title/comment also contains a tuleap reference, it should be done only once