LibJS: Replace a couple of TODO()'s in Temporal with InternalError

This helps us to distinguish between crashes because of incomplete code
paths and crashes because of genuine bugs more easily when running
test262.

Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp

@@ -828,7 +828,7 @@ ThrowCompletionOr<ISODateTime> parse_iso_date_time(GlobalObject& global_object,
     Optional<StringView> second_part;
     Optional<StringView> fraction_part;
     Optional<StringView> calendar_part;
-    TODO();
+    return vm.throw_completion<InternalError>(global_object, ErrorType::NotImplemented, "ParseISODateTime");
 
     // 3. Let year be the part of isoString produced by the DateYear production.
     // 4. If the first code unit of year is 0x2212 (MINUS SIGN), replace it with the code unit 0x002D (HYPHEN-MINUS).
@@ -961,7 +961,7 @@ ThrowCompletionOr<String> parse_temporal_calendar_string(GlobalObject& global_ob
     // a. Throw a RangeError exception.
     // 3. Let id be the part of isoString produced by the CalendarName production, or undefined if not present.
     Optional<StringView> id_part;
-    TODO();
+    return vm.throw_completion<InternalError>(global_object, ErrorType::NotImplemented, "ParseTemporalCalendarString");
 
     // 4. If id is undefined, then
     if (!id_part.has_value()) {
@@ -1014,9 +1014,9 @@ ThrowCompletionOr<ISODateTime> parse_temporal_date_time_string(GlobalObject& glo
 // 13.40 ParseTemporalDurationString ( isoString ), https://tc39.es/proposal-temporal/#sec-temporal-parsetemporaldurationstring
 ThrowCompletionOr<TemporalDuration> parse_temporal_duration_string(GlobalObject& global_object, String const& iso_string)
 {
-    (void)global_object;
     (void)iso_string;
-    TODO();
+    auto& vm = global_object.vm();
+    return vm.throw_completion<InternalError>(global_object, ErrorType::NotImplemented, "ParseTemporalDurationString");
 }
 
 // 13.43 ParseTemporalTimeString ( isoString ), https://tc39.es/proposal-temporal/#sec-temporal-parsetemporaltimestring
@@ -1052,7 +1052,7 @@ ThrowCompletionOr<TemporalTimeZone> parse_temporal_time_zone_string(GlobalObject
     Optional<StringView> seconds_part;
     Optional<StringView> fraction_part;
     Optional<StringView> name_part;
-    TODO();
+    return vm.throw_completion<InternalError>(global_object, ErrorType::NotImplemented, "ParseTemporalTimeZoneString");
 
     // 4. If z is not undefined, then
     if (z_part.has_value()) {

Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp

@@ -121,7 +121,7 @@ ThrowCompletionOr<PlainMonthDay*> to_temporal_month_day(GlobalObject& global_obj
     // FIXME: The spec has an issue in this part which makes it unimplementable, namely:
     //        - ParseTemporalMonthDayString doesn't return a [[Calendar]] field, which is required in step 7.
     //        This is a known issue, see https://github.com/tc39/proposal-temporal/issues/1502
-    TODO();
+    return vm.throw_completion<InternalError>(global_object, ErrorType::NotImplemented, "ToTemporalMonthDay");
 }
 
 // 10.5.2 CreateTemporalMonthDay ( isoMonth, isoDay, calendar, referenceISOYear [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporalmonthday