2022-October-23 - 2.6+14186

Build: remove YAML validation (#11155)

- The validated YAML files are going to be soon deprecated with 2.6 launch
  and we will no longer need to update the checked YAML files.
  Until 2.6 is launched, we can check YAML updates manually..
- YAML validation fails somewhat consistently with errors like:
> https://raw.githubusercontent.com/triplea-maps/total_world_war/master/preview.png:
>   error requesting map resource (peer not authenticated)

Builds should be very deterministic and it is important they not fail unless there is
an actual problem.