LibJS: Implement Temporal.ZonedDateTime.prototype[@@toStringTag]

Author: https://github.com/linusg
Commit: bc416ab802
Pull-request: https://github.com/SerenityOS/serenity/pull/9160
Reviewed-by: https://github.com/IdanHo ✅

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

@@ -18,6 +18,11 @@ ZonedDateTimePrototype::ZonedDateTimePrototype(GlobalObject& global_object)
 void ZonedDateTimePrototype::initialize(GlobalObject& global_object)
 {
     Object::initialize(global_object);
+
+    auto& vm = this->vm();
+
+    // 6.3.2 Temporal.ZonedDateTime.prototype[ @@toStringTag ], https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype-@@tostringtag
+    define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm.heap(), "Temporal.ZonedDateTime"), Attribute::Configurable);
 }
 
 }