Abuse Reports message truncation

What does this MR do?

Adds dynamic message truncation to abuse reports

Are there points in the code the reviewer needs to double check?

Is the new UI OK?

Why was this MR needed?

Admin UX

What are the relevant issue numbers?

Closes #13664 (closed).

Screenshots (if relevant)

UPDATED:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together Closes #13664 (closed)