stream: add regression test for async iteration completion

A test was missing for an async iterator created after the stream
had emitted 'close'. This was regressed by #31314.

See: https://github.com/nodejs/node/pull/31314

PR-URL: https://github.com/nodejs/node/pull/31508


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>