### 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)

Vector3 motion = velocity * p_delta;
	platform_rid = RID();
	platform_object_id = ObjectID();
	floor_normal = Vector3();
	platform_velocity = Vector3();
	platform_angular_velocity = Vector3();
	bool first_slide = true;
	for (int iteration = 0; iteration < max_slides; ++iteration) {
		PhysicsServer3D::MotionParameters parameters(get_global_transform(), motion, margin);
		parameters.recovery_as_collision = true; 
		PhysicsServer3D::MotionResult result;
		bool collided = move_and_collide(parameters, result, false, false);
		last_motion = result.travel;
		if (collided) {
			motion_results.push_back(result);