util: fix inspection of errors with tampered name or stack property

This makes sure that `util.inspect()` does not throw while inspecting
errors that have the name or stack property set to a different type
than string.

Fixes: https://github.com/nodejs/node/issues/30572

PR-URL: https://github.com/nodejs/node/pull/30576


Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>