This is a reland of commit d83346be

Original change's description:
> [test] Migrate cctest/test-weakmaps to unittests/
>
> Bug: v8:12781
> Change-Id: Ief6bd7ee0ff2876e19970b2fb6af4f3208ec7f4e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3815486
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82699}

Bug: v8:12781
Change-Id: I9f74c32b924433dea67f62e26a336ef7263282e7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3856096
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82717}