Temporal: Add coverage for modified Array iteration when called from CalendarFields/GetPossibleInstantsFor about test262 HOT 2 OPEN

This may be obsoleted by tc39/proposal-temporal#2519? I haven't checked yet.

from test262.

After tc39/proposal-temporal#2657 we'll have no observable array iteration if the called fields method is from a built-in calendar. It's already the case that we have no observable array iteration if the called getPossibleInstantsFor method is from a built-in time zone.

ed3a092 adds coverage for builtin fields not observably calling Array.prototype[Symbol.iterator].

So, to fulfill this issue we would still need to add coverage for:

• builtin getPossibleInstantsFor not observably calling Array.prototype[Symbol.iterator]
• return value of custom calendar fields being observably iterated
• return value of custom time zone getPossibleInstantsFor being observably iterated

from test262.