Add ability to comment on violations

Overview

As part of the Detail view for Violations epic, this issue focuses on adding a details sidebar for when the user clicks on the audit event.

Design

Design issue: Design violations for controls (#463865 - closed)

Implementation tasks

• Comments should be included in the system notes graphql query
• Use the shared Field component for creating a new note
• Reuse or create a component similar to WorkItemDiscussion to show a discussion thread in the system notes
• GraphQL mutation to add a note/thread/etc.

GraphQL query

TBD