Spec Text: https://tc39.es/proposal-temporal/#sec-temporal.plaintime.prototype.tozoneddatetime

Bug: v8:11544
Change-Id: I147b1d21b4728520c5667a30548ec77f71d7445a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3554456Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80730}