### Godot version

4.0.beta13 (caacade56)

### System information

Windows 10

### Issue description

Seems like this was missed in #62011 and #70540. `@export_multiline` should also support the PackedStringArray datatype on top of Array[String] and Dictionary, but it doesn't, instead giving the error `"@export_multiline" annotation requires a variable of type "String" but type "PackedStringArray" was given instead.`

### Steps to reproduce

Create a PackedStringArray with the `@export_multiline` annotation.
```gdscript
@export_multiline var npc_dialog: PackedStringArray
```

### Minimal reproduction project

N/A
Vector<StringName> valid_types;
			valid_types.push_back("Viewport");
			scene_tree->get_scene_tree()->set_valid_types(valid_types);
			scene_tree->get_scene_tree()->set_show_enabled_subscene(true);
			add_child(scene_tree);
			scene_tree->connect("selected", callable_mp(this, &EditorPropertyResource::_viewport_selected));
		}
		scene_tree->popup_scenetree_dialog();
	}
}
void EditorPropertyResource::_sub_inspector_property_keyed(const String &p_property, const Variant &p_value, bool p_advance) {
	
	const Variant args[3] = { String(get_edited_property()) + ":" + p_property, p_value, p_advance };
	const Variant *argp[3] = { &args[0], &args[1], &args[2] };
	emit_signalp(SNAME("property_keyed_with_value"), argp, 3);
}
void EditorPropertyResource::_sub_inspector_resource_selected(const Ref<Resource> &p_resource, const String &p_property) {
	emit_signal(SNAME("resource_selected"), String(get_edited_property()) + ":" + p_property, p_resource);
}
void EditorPropertyResource::_sub_inspector_object_id_selected(int p_id) {
	emit_signal(SNAME("object_id_selected"), get_edited_property(), p_id);
}
void EditorPropertyResource::_open_editor_pressed() {
	Ref<Resource> res = get_edited_object()->get(get_edited_property());
	if (res.is_valid()) {
		
		callable_mp(EditorNode::get_singleton(), &EditorNode::edit_item).bind(res.ptr(), this).call_deferred();
	}
}
void EditorPropertyResource::_update_property_bg() {