test,benchmark: stop requiring URL and URLSearchParams

Since the URL and URLSearchParams classes are available in the
global object, there is no need to require them from 'url'.

PR-URL: https://github.com/nodejs/node/pull/36927


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>