1. fix year value between 100 and 9999 should use 4 digit padding without '+' prefix to sync with the latest spec in
mjsunit/temporal/plain-date-time-to-json

2. Change the the toPlainDateTime to accept object with partial time fields to sync with current spect in
test/mjsunit/temporal/plain-date-to-plain-date-time.js

3. Change the test to accept input parameter type to Number instead of BigInt for Instant fromEpochSeconds and from EpochMilliseconds in
test/mjsunit/temporal/instant-from-epoch-milliseconds.js and
test/mjsunit/temporal/instant-from-epoch-seconds.js
Throw TypeError if the type is BigInt.

4. Change the return type of Instant epochSeconds and epochMilliseconds from BigInt to Number to sync with the spec in
test/mjsunit/temporal/instant-constructor.js

Spec text
https://tc39.es/proposal-temporal/#sec-temporal-padisoyear
https://tc39.es/proposal-temporal/#sec-temporal-totemporaltimerecord
https://tc39.es/proposal-temporal/#sec-temporal.instant.fromepochmilliseconds
https://tc39.es/proposal-temporal/#sec-temporal.instant.fromepochseconds
https://tc39.es/proposal-temporal/#sec-get-temporal.zoneddatetime.prototype.epochmilliseconds
https://tc39.es/proposal-temporal/#sec-get-temporal.zoneddatetime.prototype.epochseconds

Bug: v8:11544
Change-Id: Icd290905b65fdabbedece27e59c785635c212ec2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3807122Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82185}