### 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
switch (p_what) {
		case NOTIFICATION_THEME_CHANGED:
		case NOTIFICATION_ENTER_TREE: {
			change_type->clear();
			for (int i = 0; i < Variant::VARIANT_MAX; i++) {
				if (i == Variant::CALLABLE || i == Variant::SIGNAL || i == Variant::RID) {
					
					continue;
				}
				String type = Variant::get_type_name(Variant::Type(i));
				change_type->add_icon_item(get_theme_icon(type, SNAME("EditorIcons")), type, i);
			}
			change_type->add_separator();
			change_type->add_icon_item(get_theme_icon(SNAME("Remove"), SNAME("EditorIcons")), TTR("Remove Item"), Variant::VARIANT_MAX);
			if (button_add_item) {
				button_add_item->set_icon(get_theme_icon(SNAME("Add"), SNAME("EditorIcons")));
			}
		} break;
		case NOTIFICATION_DRAG_BEGIN: {
			if (is_visible_in_tree()) {
				if (_is_drop_valid(get_viewport()->gui_get_drag_data())) {