Since we now promote all young objects into old space on full GCs, we
don't need to sweep pages for iterability anymore in new space.

Minor MC doesn't need to make a page iterable when promoting the full
page into the new space. This is because maps are not reclaimed during
a minor GC.

Bug: v8:12760
Change-Id: I16d666e417d00ebf450453864cbd87afd6606afc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3635723Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80447}