Use DescriptorArray::Set instead of Append to avoid resorting the
descriptors for every newly added property

Bug: v8:11525
Change-Id: Id6d113f6218e095125256a8c7c8cfb28c8b41ae5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3415391Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78769}