Fix commit mention font inconsistency

What does this MR do?

Removes the mono font styling for the auto linked commit hashes.

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

Shouldn't be

Why was this MR needed?

Resolve existing UI inconsistency

What are the relevant issue numbers?

Closes #20936 (closed)

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • 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