[12.x] Render newlines in query tooltip #57310
   Merged  
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This fixes frontend breakage on the exception renderer by escaping tooltip content and converting newlines to
<br>. It applies to queries, formatted source, request headers, and routing values, preventing layout overlap and syntax highlighter glitches when tooltip content contains newlines. Fixes #57246.No breaking changes. This affects only the debug exception renderer UI and does not change any APIs.