Follow-up from #393900: Step 3

What does this MR do and why?

As per #418108 (closed) and #393900 (closed) we're cleaning up ChatName class.

This is the last step of the clean-up.

Screenshots or screen recordings

N/A

How to set up and validate locally

N/A

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.

Related to #418108 (closed)