### 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
case LAYER_PHYSICS_3D: {
			basename = "layer_names/3d_physics";
			layer_group_size = 4;
			layer_count = 32;
		} break;
		case LAYER_NAVIGATION_3D: {
			basename = "layer_names/3d_navigation";
			layer_group_size = 4;
			layer_count = 32;
		} break;
	}
	Vector<String> names;
	Vector<String> tooltips;
	for (int i = 0; i < layer_count; i++) {
		String name;
		if (ProjectSettings::get_singleton()->has_setting(basename + vformat("/layer_%d", i + 1))) {
			name = GLOBAL_GET(basename + vformat("/layer_%d", i + 1));
		}
		if (name.is_empty()) {
			name = vformat(TTR("Layer %d"), i + 1);
		}
		names.push_back(name);
		tooltips.push_back(name + "\n" + vformat(TTR("Bit %d, value %d"), i, 1 << i));
	}
	grid->names = names;
	grid->tooltips = tooltips;
	grid->layer_group_size = layer_group_size;
	grid->layer_count = layer_count;
}
void EditorPropertyLayers::set_layer_name(int p_index, const String &p_name) {