### 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
float ifl = i / float(point_count);
		const float h = 1.0 - Math::ease(ifl, exp);
		if (flip) {
			ifl = 1.0 - ifl;
		}
		points.push_back(Point2(ifl * s.width, h * s.height));
	}
	easing_draw->draw_polyline(points, line_color, 1.0, true);
	
	int decimals;
	if (Math::abs(exp) < 0.1 - CMP_EPSILON) {
		decimals = 4;
	} else if (Math::abs(exp) < 1 - CMP_EPSILON) {
		decimals = 3;
	} else if (Math::abs(exp) < 10 - CMP_EPSILON) {
		decimals = 2;
	} else {
		decimals = 1;
	}
	f->draw_string(ci, Point2(10, 10 + f->get_ascent(font_size)), TS->format_number(rtos(exp).pad_decimals(decimals)), HORIZONTAL_ALIGNMENT_LEFT, -1, font_size, font_color);
}
void EditorPropertyEasing::update_property() {
	easing_draw->queue_redraw();
}
void EditorPropertyEasing::_set_preset(int p_preset) {
	static const float preset_value[EASING_MAX] = { 0.0, 1.0, 2.0, 0.5, -2.0, -0.5 };
	emit_changed(get_edited_property(), preset_value[p_preset]);
	easing_draw->queue_redraw();
}
void EditorPropertyEasing::_setup_spin() {