Temporal: Remove tests for part of the approved slate of removals

[ptomato]

Mostly deletions, and some replacements of deleted API.

This makes tests compliant with the following removals that reached consensus in the TC39 meeting of 2024-06-12:

• Temporal.PlainDateTime.p.withPlainDate
• Temporal.ZonedDateTime.p.withPlainDate
• Temporal.PlainTime.p.toPlainDateTime
• Temporal.PlainTime.p.toZonedDateTime
• Temporal.Instant.fromEpochSeconds
• Temporal.Instant.fromEpochMicroseconds
• Temporal.Instant.p.epochSeconds
• Temporal.Instant.p.epochMicroseconds
• Temporal.ZonedDateTime.p.epochSeconds
• Temporal.ZonedDateTime.p.epochMicroseconds
• Temporal.PlainDateTime.p.toPlainYearMonth
• Temporal.PlainDateTime.p.toPlainMonthDay
• Temporal.ZonedDateTime.p.toPlainYearMonth
• Temporal.ZonedDateTime.p.toPlainMonthDay
• Temporal.Instant.p.toZonedDateTime
• Temporal.Now.zonedDateTime
• Temporal.Now.plainDateTime
• Temporal.Now.plainDate

See: tc39/proposal-temporal#2846, tc39/proposal-temporal#2847, tc39/proposal-temporal#2848, tc39/proposal-temporal#2849.

[ptomato]

Thanks for the quick review. Luckily, very few actual changes, mostly just removals.

[littledan]

Can we add some new tests to assert that these methods aren't exposed? I think it's a pretty likely bug that someone will forget to remove some of them.

[ptomato]

The difficult part about that, I realized, is that it's totally spec-compliant to forget to remove them, according to https://tc39.es/ecma262/#sec-conformance. Although we don't want that, due to the risk of not being able to add them back in the future! So I'd still want to go ahead with it regardless.