Reflect state transition comments in system notes

What does this MR do and why?

With this change, the comment given while updating the state of a vulnerability will be reflected in the system note created and will be shown on the vulnerability detail page.

Related to Reflect user comment on vulnerability state cha... (#408744 - closed).

Screenshots or screen recordings

How to set up and validate locally

Change the state of a vulnerability via GraphQL API and set a comment. Verify that the comment is shown in the system note on "Vulnerability Detail" page.

Example GraphQL query to dismiss a vulnerability

mutation DismissVulnerability($id: VulnerabilityID!, $dismissalReason: VulnerabilityDismissalReason, $comment: String!) {
  vulnerabilityDismiss(input: { id: $id, dismissalReason: $dismissalReason, comment: $comment }) {
    vulnerability {
      id
      state
    }
  }
}

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.