AI resolved vuln MR: Link to vulnerability

What does this MR do and why?

AI resolved vuln MR: Link to vulnerability

When a user creates an MR via AI to resolve a vulnerability, there is currently to reference to that vulnerability.

This change adds a link to the vulnerability to the MR's description.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #477420 (closed)