Enable the prefinalizers scope and add a top level AtomicSweep scope
so that prefinalizers are accounted as part of sweeping.

Change-Id: I9dade6a2367d30d20395de30c3db84922fee5a49
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3306567Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78185}