Merge branch '23661-lacking-padding-on-syntax-highlight-blocks-in-diff-comments' into 'master'

Resolve "Lacking padding on syntax highlight blocks in diff comments"

Enforces horizontal padding on highlight block.

There was no horizontal padding on diff comment highlight blocks.

Closes #23661

See merge request !7062
Signed-off-by: Rémy Coutable <remy@rymai.me>

app/views/projects/diffs/_parallel_view.html.haml

 / Side-by-side diff view
-%div.text-file.diff-wrap-lines.code.file-content.js-syntax-highlight{ data: diff_view_data }
+%div.text-file.diff-wrap-lines.code.js-syntax-highlight{ data: diff_view_data }
   %table
     - last_line = 0
     - diff_file.parallel_diff_lines.each do |line|