stream: don't destroy on async iterator success

Destroying on async iterator completion ignores autoDestroy.

PR-URL: https://github.com/nodejs/node/pull/35122


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>