### Godot version

v4.0.3.stable.official [5222a99f5]

### System information

Windows 10

### Issue description

If a `CharacterBody3D`'s parent node is in a position other than the origin, the difference will be included in its `get_position_delta()` value, and therefore also `get_real_velocity()`. This is because [the implementation](https://github.com/godotengine/godot/blob/3710f069293f2fde8afe33fea898c4b36fa5e943/scene/3d/physics_body_3d.cpp#L1782-L1784) subtracts the current **local** transform from the old **global** transform. I don't know if behaviour in this case is defined at all, but I would expect it to be consistent with everything else in the `CharacterBody3D` context, such that if `velocity` is zero, `get_position_delta()` is also zero. The same applies to `CharacterBody2D`.

### Steps to reproduce

1. Create a `Node3D` with a `CharacterBody3D` in it
2. Move the `Node3D`
3. Call `move_and_slide()` in the `CharacterBody3D` and observe `get_position_delta()`

### Minimal reproduction project

[godot cb3d.zip](https://github.com/godotengine/godot/files/11861307/godot.cb3d.zip)

bool body_in = p_status == 1;
	ObjectID objid = p_instance;
	Object *obj = ObjectDB::get_instance(objid);
	Node *node = Object::cast_to<Node>(obj);
	ERR_FAIL_NULL(contact_monitor);
	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(objid);
	ERR_FAIL_COND(!body_in && !E);
	if (body_in) {
		if (!E) {
			E = contact_monitor->body_map.insert(objid, BodyState());
			E->value.rid = p_body;
			
			E->value.in_tree = node && node->is_inside_tree();
			if (node) {
				node->connect(SceneStringNames::get_singleton()->tree_entered, callable_mp(this, &RigidBody3D::_body_enter_tree).bind(objid));
				node->connect(SceneStringNames::get_singleton()->tree_exiting, callable_mp(this, &RigidBody3D::_body_exit_tree).bind(objid));
				if (E->value.in_tree) {
					emit_signal(SceneStringNames::get_singleton()->body_entered, node);
				}
			}
		}
		
		if (node) {
			E->value.shapes.insert(ShapePair(p_body_shape, p_local_shape));
		}
		if (E->value.in_tree) {