Update UTC time zone canonicalization to match proposal-canonical-tz #4336
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The test for tc39/ecma402#724 (added in tc39#4328) didn't take the Time Zone Canonicalization proposal into account; but it should, because that proposal is stage 3. As of that proposal, the [[TimeZone]] slot of DateTimeFormat gets the case-regularized original identifier, no longer the primary identifier. So the resolvedOptions().timeZone property also no longer returns the primary identifier.
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The test for tc39/ecma402#724 (added in #4328) didn't take the Time Zone Canonicalization proposal into account; but it should, because that proposal is stage 3.
As of that proposal, the [[TimeZone]] slot of DateTimeFormat gets the case-regularized original identifier, no longer the primary identifier. So the resolvedOptions().timeZone property also no longer returns the primary identifier.