### 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
size_slider->set_max(1000000);
			size_slider->set_h_size_flags(SIZE_EXPAND_FILL);
			size_slider->set_read_only(is_read_only());
			size_slider->connect("value_changed", callable_mp(this, &EditorPropertyArray::_length_changed));
			hbox->add_child(size_slider);
			property_vbox = memnew(VBoxContainer);
			property_vbox->set_h_size_flags(SIZE_EXPAND_FILL);
			vbox->add_child(property_vbox);
			button_add_item = EditorInspector::create_inspector_action_button(TTR("Add Element"));
			button_add_item->set_icon(get_theme_icon(SNAME("Add"), SNAME("EditorIcons")));
			button_add_item->connect(SNAME("pressed"), callable_mp(this, &EditorPropertyArray::_add_element));
			button_add_item->set_disabled(is_read_only());
			vbox->add_child(button_add_item);
			paginator = memnew(EditorPaginator);
			paginator->connect("page_changed", callable_mp(this, &EditorPropertyArray::_page_changed));
			vbox->add_child(paginator);
		} else {
			
			for (int i = property_vbox->get_child_count() - 1; i >= 0; i--) {
				Node *child = property_vbox->get_child(i);
				if (child == reorder_selected_element_hbox) {
					continue; 
				}
				child->queue_free(); 
				property_vbox->remove_child(child);
			}
		}
		size_slider->set_value(size);
		property_vbox->set_visible(size > 0);
		button_add_item->set_visible(page_index == max_page);