Now that all known correctness issues with map space compaction are
fixed, add more test coverage by enabling it with --future.

Bug: v8:12578
Change-Id: I23d04a162f742480c4e83de1f3980509543e5a97
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3460409Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79100}