Implement the changes in
https://github.com/tc39/proposal-intl-locale-info/pull/44
So weekInfo will return weekend as an array instead of weekendStart
and weekendEnd.

Bug: v8:11638
Change-Id: I775b003b36f67179943911faa7f77a323ad9f6f1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3307685Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78172}