Invalidate tow data on both vehicles on car crash

[BrettDong]

Summary

SUMMARY: Bugfixes "Fix error message on towed vehicle crashed with towing vehicle"

Purpose of change

Fix #46517.

Describe the solution

Invalidate tow data on both vehicles.

Describe alternatives you've considered

None.

Testing

Follow the steps to reproduce #46517:

1. Spawn a heavy duty cargo truck
2. Spawn a Beetle behind
3. Spawn a heavy duty tow cable
4. Link two vehicles with tow cable
5. Drive cargo truck, speed up to 64 km/h, drive for a little while so Beetle also gains the speed
6. Suddenly decrease target speed to -64 km/h
7. Observe cargo truck slows down in a sudden and Beetle collides with cargo truck

Observe that

1. There is no longer error message popping up
2. Two vehicles are decoupled
3. Both vehicles can be towed again

Additional context

@mlangsdorf Is this the right fix?

[mlangsdorf]

Thanks for tracking this down.