Improve related merge requests markup
What does this MR do and why?
This MR improves related merge requests markup by removing unnecessary tags and updating some CSS classes to gitlab-ui ones
Screenshots or screen recordings
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How to set up and validate locally
- Visit an issue such as
http://127.0.0.1:3000/flightjs/Flight/-/issues/1, and make sure that a merge request has referred to it with#1in a comment to make them related - Check the changes
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #341816 (closed)