Main thread (the one that WS endpoint connects to) should be able
to report all workers.
PR-URL: https://github.com/nodejs/node/pull/28872
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
