Added colored labels to related MR list.

What does this MR do?

Added colored labels to related MR list.

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

Yes, I think haml can be better.

Why was this MR needed?

There was an issue for this #21200 (closed)

Screenshots (if relevant)

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 merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Fixes !21200 (merged)