Enable PlainDate.prototype.toZonedDateTime method

[nekevss]

This Pull Request is related to the ongoing work for #1804 and #4071.

Briefly looking over the test262 results locally, the remaining failing tests for this suite should be related to similar parsing bugs for other methods, and should be fixed with subsequent temporal_rs updates.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	50,254	50,254	0
Passed	46,761	46,778	+17
Ignored	1,634	1,634	0
Failed	1,859	1,842	-17
Panics	0	0	0
Conformance	93.05%	93.08%	+0.03%

Fixed tests (17):

test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-zoneddatetime-negative-epochnanoseconds.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-string-date-with-utc-offset.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-string-with-time-designator.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/plaintime-argument-zoneddatetime-balance-negative-time-units.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/plaintime-propertybag-no-time-units.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/timezone-string-multiple-offsets.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-string-calendar-annotation.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/basic.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-string-time-separators.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/leap-second.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/timezone-string.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-string-unknown-annotation.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/timezone-string-leap-second.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/argument-string-time-zone-annotation.js (previously Failed)
test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/order-of-operations.js (previously Failed)
test/intl402/Temporal/PlainDate/prototype/toZonedDateTime/timezone-string-datetime.js (previously Failed)
test/intl402/Temporal/PlainDate/prototype/toZonedDateTime/dst-skipped-cross-midnight.js (previously Failed)