test: test add and remove for lib/domain

Testing some of the more specific cases of using domain.add and
domain.remove. For example, calling domain.add twice with same event
emmiter and actually removing an event emitter from the domain.

PR-URL: https://github.com/nodejs/node/pull/24163


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>