ErrorInfo: add noIndent; builtins.warn: do not indent message when starting with a newline #14794
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Motivation
Multi-line warnings currently get extra spaces to align with the "evaluation warning: " prefix. However, sometimes it's necessary to display a large multi-line warning with custom formatting, and this padding is unnecessary. I think if a warning starts with a new line, it makes sense not to add padding to it.
Context
Before/After

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