1. Move the use of MAYBE_RETURN to MAYBE_ASSIGN_RETURN_ON_EXCEPTION_VALUE
if possible.
2. Remove some MYABE_RETURN in the wrong spot and therefore fix some tests.
3. Change Intl::GetTimeZoneIndex() to return Maybe<int32_t> as index and use
< 0 value to indicate not getting index to make the function signature
simpler.

Bug: v8:11544
Change-Id: I685cbff142e9dea69ef316a1bc180730aef5aec8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3625839Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80379}