Windows Formatting job failing because it can't find Python on the path

I spoke with @MattGal offline and it seems like the new images don't contain python2 anymore and that is what is breaking this job. @MattGal is going to give a shot on fixing this issue. 

```
##[error]Parameter 'toolPath' cannot be null or empty.
```

https://dev.azure.com/dnceng/public/_build/results?buildId=562848

cc: @dotnet/runtime-infrastructure 