### 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
EditorPropertyRect2 *editor = memnew(EditorPropertyRect2);
					editor->setup(-100000, 100000, default_float_step, true);
					prop = editor;
				} break;
				case Variant::RECT2I: {
					EditorPropertyRect2i *editor = memnew(EditorPropertyRect2i);
					editor->setup(-100000, 100000);
					prop = editor;
				} break;
				case Variant::VECTOR3: {
					EditorPropertyVector3 *editor = memnew(EditorPropertyVector3);
					editor->setup(-100000, 100000, default_float_step, true);
					prop = editor;
				} break;
				case Variant::VECTOR3I: {
					EditorPropertyVector3i *editor = memnew(EditorPropertyVector3i);
					editor->setup(-100000, 100000);
					prop = editor;
				} break;
				case Variant::VECTOR4: {
					EditorPropertyVector4 *editor = memnew(EditorPropertyVector4);
					editor->setup(-100000, 100000, default_float_step, true);
					prop = editor;
				} break;
				case Variant::VECTOR4I: {
					EditorPropertyVector4i *editor = memnew(EditorPropertyVector4i);
					editor->setup(-100000, 100000);
					prop = editor;
				} break;
				case Variant::TRANSFORM2D: {