chore(markdown): add handled to copy to markdown

[shayna-ch]

add **handled** in exceptions to copy to markdown. mirrored from Seer

## Exceptions

### Exception 1
**Type:** KeyError
**Handled:** Yes
**Value:** 'user_id'

#### Stacktrace
...

------
### Exception 2
**Type:** ValidationError
**Handled:** No
**Value:** Missing required field: user_id

#### Stacktrace
...

stacked with #117882

[shayna-ch]

bugbot run

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^{Reviewed by Cursor Bugbot for commit 2bf9458. Configure here.}