Retain newlines in chat template when `continue_final_message=True` (#34253)
* Retain newlines in chat template when
* Add try/except
* Add regression test
* Simplify test
* Apply suggestions from code review
Co-authored-by: Matt <Rocketknight1@users.noreply.github.com>
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Co-authored-by: Matt <Rocketknight1@users.noreply.github.com>