http: free listeners on free sockets

Reduced memory usage by ensuring free sockets don't have extra
listeners while in the pool.

PR-URL: https://github.com/nodejs/node/pull/29259


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>