Fix wrong CRLF rendering

What does this MR do and why?

Fixes #369588 (closed)

In the past, CRLF was always converted to LF. If I understand it correctly, this is no longer desired.

• #21431 (closed)
• gitaly#3476 (closed)

Therefore the UI should be able to handle different types of linebreaks.

The problem is that the dos-linebreaks (CRLF) are in the form \r\n and so far the lines are only split by \n, so \r is left out, which is also interpreted as newline. See images below

Screenshots or screen recordings

Input:

Before:

After:

How to set up and validate locally

1. Create a new project
2. Create a file locally called hi.h with the following content:

/*
 * This is a comment block
 * There should only be
 * One space between
 * These lines
*/

3. Ensure it has CRLF line terminators. This can be done via vim :set ff=dos
4. Push the file to your project.
5. Confirm Preview syntax highlighting.

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