WIP: Line Folding in Build Trace

What does this MR do?

• Adds line folding to the build trace

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

• Are the escape codes I used for folding acceptable?

Why was this MR needed?

• Opened per @ayufan's request https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5327#note_13260610

What are the relevant issue numbers?

• https://gitlab.com/gitlab-org/gitlab-ce/issues/13205#note_13152401

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 style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together