### 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
String name = p_name;
	if (name.begins_with("indices")) {
		int index = name.get_slicec('/', 1).to_int();
		array.set(index, p_value);
		return true;
	}
	return false;
}
bool EditorPropertyArrayObject::_get(const StringName &p_name, Variant &r_ret) const {
	String name = p_name;
	if (name.begins_with("indices")) {
		int index = name.get_slicec('/', 1).to_int();
		bool valid;
		r_ret = array.get(index, &valid);
		if (r_ret.get_type() == Variant::OBJECT && Object::cast_to<EncodedObjectAsID>(r_ret)) {
			r_ret = Object::cast_to<EncodedObjectAsID>(r_ret)->get_object_id();
		}
		return valid;
	}
	return false;
}
void EditorPropertyArrayObject::set_array(const Variant &p_array) {