test: add net regression test

Ensure that the socket is not destroyed when the 'end'
event is emitted.

Refs: https://github.com/nodejs/node/pull/32780#issuecomment-612602551

PR-URL: https://github.com/nodejs/node/pull/32794


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>