fixes large text tooltip in diff file name

What does this MR do?

This fixes cutoff filename bug for large diff file name

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

NR

Why was this MR needed?

Fixes filename cut off

Screenshots (if relevant)

Before

After

Does this MR meet the acceptance criteria?

• Changelog entry added
• Tests
  • All builds are passing
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #28499 (closed)