Update CSharp docker container

[neomatrix369]

Remove any baboon related scripts and references from the Dockerfile for csharp Docker container

[neomatrix369]

~~~ Summary of test executions ~~~
  ~~~ Passed Tests ~~~
  language=csharp|challenge=SUM|expected=100|actual=100
  language=csharp|challenge=TST|expected=50|actual=50
  language=csharp|challenge=CHK|expected=0|actual=0
  language=csharp|challenge=xyz|expected=0|actual=0
  4 test(s) passed

  ~~~ Failed Tests ~~~
  0 test(s) failed