Add milestone to `vulnerability_finding_replace_metadata`

What does this MR do and why?

Add milestone to vulnerability_finding_replace_metadata

Based on rollout: !66868 (merged)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.