This is the 1. CL in a series of CollectGarbage refactoring CLs.

Bug:v8:12503

Change-Id: Ia0871df79bf9e1732d6c416079a387cd494196ac
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3419918Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78807}