Fix raw error crashing HTML reporter, add types, and share error helper #4999
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Description
There was one call site where we were accidentally passing a raw Exception as a message instead of a serialised summary, which was crashing the HTML reporter.
This commit corrects this by serialising at that site, adds more types to Message to automatically warn for this category of issue in the future, and pulls the stack trace formatting code out into a public function to provide more error details in more places.
Checklist
CHANGELOG.md