### 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
const String property_name = basename + vformat("/layer_%d", p_index + 1);
	if (ProjectSettings::get_singleton()->has_setting(property_name)) {
		ProjectSettings::get_singleton()->set(property_name, p_name);
		ProjectSettings::get_singleton()->save();
	}
}
String EditorPropertyLayers::get_layer_name(int p_index) const {
	const String property_name = basename + vformat("/layer_%d", p_index + 1);
	if (ProjectSettings::get_singleton()->has_setting(property_name)) {
		return GLOBAL_GET(property_name);
	}
	return String();
}
void EditorPropertyLayers::_button_pressed() {