events: allow dispatch many times without listener

Fast path for EventTarget dispatch with no listeners didn't reset
kIsBeingDispatched flag, meaning same event couldn't be dispatched
multiple times.

PR-URL: https://github.com/nodejs/node/pull/39772
Refs: https://github.com/nodejs/node/pull/39395


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>