perf_hooks: fix scheduling regression

Scheduling a PerformanceGCCallback should not keep the
loop alive but due to the recent switch to using the
native SetImmediate method, it does. Go back to using
uv_async_t and add a regression test.

PR-URL: https://github.com/nodejs/node/pull/18051
Fixes: https://github.com/nodejs/node/issues/18047
Refs: https://github.com/nodejs/node/pull/18020


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