Ignore vulnerability item and update doc
What does this MR do and why?
Describe in detail what your merge request does and why.
I noticed we tried to delete vulnerability items but failed https://ops.gitlab.net/gitlab-org/quality/production/-/jobs/7387425. I don't think this can be deleted so I'm adding it to the ignore list. Also update doc to reflect this for future cases.
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.
Edited by Tiffany Rea