repl: indicate if errors are thrown or not

Currently an error is printed identical, no matter if it is just
inspected or if the error is thrown inside of the REPL. This makes
sure we are able to distinguish these cases.

PR-URL: https://github.com/nodejs/node/pull/25253


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>