For cases in the previous commit that actually removed some functionality
from tests in built-ins/, add corresponding tests in intl402/ to preserve
test coverage of that functionality for hosts that do support Intl.
Currently, this test is not conformant to the proposal text.
Temporal.TimeZone.from() calls ToTemporalTimeZone. Since the argument is
a string, we next go to ParseTemporalTimeZone, where on a string such as
`1994-11-05T08:15:30-05:00[UTC]` we would return _result_.[[Name]] (which
would be equal to `UTC`) and discard the UTC offset string.