### 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
for (int i = 0; i < 4; i++) {
		spin[i] = memnew(EditorSpinSlider);
		spin[i]->set_label(desc[i]);
		spin[i]->set_flat(true);
		if (grid) {
			bc->get_child(i / 2)->add_child(spin[i]);
		} else {
			bc->add_child(spin[i]);
		}
		add_focusable(spin[i]);
		spin[i]->connect("value_changed", callable_mp(this, &EditorPropertyRect2::_value_changed).bind(desc[i]));
		if (horizontal) {
			spin[i]->set_h_size_flags(SIZE_EXPAND_FILL);
		}
	}
	if (!horizontal) {
		set_label_reference(spin[0]); 
	}
}
void EditorPropertyVector3::_set_read_only(bool p_read_only) {
	for (int i = 0; i < 3; i++) {
		spin[i]->set_read_only(p_read_only);
	}
}
void EditorPropertyVector3::_value_changed(double val, const String &p_name) {
	if (setting) {
		return;
	}
	if (linked->is_pressed()) {
		setting = true;