### Godot version

4.2 247c354

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

#75778 exposed `_validate_property()` to scripting. It's implemented in GDScript and C#, but not GDExtension (depends on #78634).
https://github.com/godotengine/godot/blob/247c3548d810136ffe9c1694cd76db3236efaa90/core/object/script_language_extension.h#L685-L687

Relevant discussion: https://github.com/godotengine/godot/pull/75778#discussion_r1307294940

### Steps to reproduce

1. Add GDExtension script
2. Use `_validate_property()`

### Minimal reproduction project

N/A
REGISTER_INTERFACE_FUNC(dictionary_operator_index);
	REGISTER_INTERFACE_FUNC(dictionary_operator_index_const);
	REGISTER_INTERFACE_FUNC(object_method_bind_call);
	REGISTER_INTERFACE_FUNC(object_method_bind_ptrcall);
	REGISTER_INTERFACE_FUNC(object_destroy);
	REGISTER_INTERFACE_FUNC(global_get_singleton);
	REGISTER_INTERFACE_FUNC(object_get_instance_binding);
	REGISTER_INTERFACE_FUNC(object_set_instance_binding);
	REGISTER_INTERFACE_FUNC(object_set_instance);
	REGISTER_INTERFACE_FUNC(object_get_class_name);
	REGISTER_INTERFACE_FUNC(object_cast_to);
	REGISTER_INTERFACE_FUNC(object_get_instance_from_id);
	REGISTER_INTERFACE_FUNC(object_get_instance_id);
	REGISTER_INTERFACE_FUNC(ref_get_object);
	REGISTER_INTERFACE_FUNC(ref_set_object);
#ifndef DISABLE_DEPRECATED
	REGISTER_INTERFACE_FUNC(script_instance_create);
#endif 
	REGISTER_INTERFACE_FUNC(script_instance_create2);
	REGISTER_INTERFACE_FUNC(placeholder_script_instance_create);
	REGISTER_INTERFACE_FUNC(placeholder_script_instance_update);
	REGISTER_INTERFACE_FUNC(object_get_script_instance);
	REGISTER_INTERFACE_FUNC(classdb_construct_object);
	REGISTER_INTERFACE_FUNC(classdb_get_method_bind);
	REGISTER_INTERFACE_FUNC(classdb_get_class_tag);
	REGISTER_INTERFACE_FUNC(editor_add_plugin);
	REGISTER_INTERFACE_FUNC(editor_remove_plugin);
}
#undef REGISTER_INTERFACE_FUNCTION