What does this MR do?
Fixes ! support to autocomplete MRs within Issue and MR comment/description fields. This was broken since %10.8 and came from https://gitlab.com/gitlab-org/gitlab-ce/commit/5c2078838bb9de710f9025513c4b6ec664bba313.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Backend maintainer
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Conform by the merge request performance guides -
Conform by the style guides -
If you have multiple commits, please combine them into a few logically organized commits by squashing them
What are the relevant issue numbers?
Closes #48528 (closed)