R4T: https://groups.google.com/a/chromium.org/g/blink-dev/c/e4Ict1TT9FE/m/aq69ne3rBAAJ
Spec: https://tc39.es/proposal-intl-extend-timezonename/
https://chromestatus.com/guide/edit/4506375298220032

Bug: v8:11661
Change-Id: Ifa7571f4bb23c1852ada6c0f13e27611f7e5791d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2924525Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74933}