src: no SetImmediate from destructor in stream_pipe code

Guard against running `SetImmediate()` from the destructor.
The object will not be alive or usable in the callback,
so it does not make sense to attempt to schedule the
`SetImmediate()`.

PR-URL: https://github.com/nodejs/node/pull/30666
Fixes: https://github.com/nodejs/node/issues/30643
Refs: https://github.com/nodejs/node/pull/30374


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>