test: check socketOnDrain where needPause is false

Adds a tests that checks if we can start reading again
from a socket backing an incoming http request.

PR-URL: https://github.com/nodejs/node/pull/17654


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>