### 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
EditorPropertyProjection *editor = memnew(EditorPropertyProjection);
					editor->setup(-100000, 100000, default_float_step, true);
					prop = editor;
				} break;
				
				case Variant::COLOR: {
					prop = memnew(EditorPropertyColor);
				} break;
				case Variant::STRING_NAME: {
					EditorPropertyText *ept = memnew(EditorPropertyText);
					ept->set_string_name(true);
					prop = ept;
				} break;
				case Variant::NODE_PATH: {
					prop = memnew(EditorPropertyNodePath);
				} break;
				case Variant::RID: {
					prop = memnew(EditorPropertyRID);
				} break;
				case Variant::OBJECT: {
					if (Object::cast_to<EncodedObjectAsID>(value)) {
						EditorPropertyObjectID *editor = memnew(EditorPropertyObjectID);
						editor->setup("Object");
						prop = editor;
					} else {
						EditorPropertyResource *editor = memnew(EditorPropertyResource);
						editor->setup(object.ptr(), prop_name, "Resource");
						editor->set_use_folding(is_using_folding());
						prop = editor;
					}