Trim extra displayed carriage returns in diffs and files with CRLFs

What does this MR do?

This MR strips out extra carriage returns at the end of each tokenized string.

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

Does this remove more than we need?

Why was this MR needed?

Windows users would see extra lines in their files. Newline characters are already added with every line in the HTML formatter.

What are the relevant issue numbers?

#20440 (closed), gitlab-com/support-forum#892, #20468 (closed)

Does this MR meet the acceptance criteria?

• CHANGELOG entry 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