### 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
int offset = page_index * page_length;
		int amount = MIN(size - offset, page_length);
		int total_amount = page_index == max_page ? amount + 2 : amount; 
		VBoxContainer *add_vbox = nullptr;
		double default_float_step = EDITOR_GET("interface/inspector/default_float_step");
		for (int i = 0; i < total_amount; i++) {
			String prop_name;
			Variant key;
			Variant value;
			if (i < amount) {
				prop_name = "indices/" + itos(i + offset);
				key = dict.get_key_at_index(i + offset);
				value = dict.get_value_at_index(i + offset);
			} else if (i == amount) {
				prop_name = "new_item_key";
				value = object->get_new_item_key();
			} else if (i == amount + 1) {
				prop_name = "new_item_value";
				value = object->get_new_item_value();
			}
			EditorProperty *prop = nullptr;
			switch (value.get_type()) {
				case Variant::NIL: {
					prop = memnew(EditorPropertyNil);
				} break;
				
				case Variant::BOOL: {
					prop = memnew(EditorPropertyCheck);
				} break;
				case Variant::INT: {