Use banner to announce line endings change warning in diffs #18084
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xref. https://github.com/github/accessibility-audits/issues/7012
Description
After the work from #18069 , @tidy-dev pointed out that even with that change the icon would still not be fully accessible, so she suggested to use the warning banner we have for Unicode bidi characters (included in #13343).
This PR does exactly that. However, when both warnings (Unicode bidi characters and line endings change) are present, we have considered two: warnings stacked with no separator or with separator. In the end we decided to go with separator, but we're open to hear other ideas.
Screenshots
Release notes
Notes: [Fixed] Promote line endings change warning from icon to a banner, improving its accessibility