'calendar' and 'numberingSystem' should not be string literals

[DanielRosenwasser]

@orta this should be revised/reverted. List of numbering system & calendar are NOT part of the ECMA402 spec. They conform to Unicode Locale Identifier semantic restriction, but the list can change every CLDR version which is separate from ECMA402.

Reference of failure upstream: formatjs/formatjs#2616

Originally posted by @longlho in #42134 (comment)