Remove duplicate aliases

[amoghmc]

Aliases csharp and fsharp already exist and are not needed.
This fixes the below errors:

Unhandled exception. System.ArgumentException: The kernel name or alias 'csharp' is already in use.
Unhandled exception. System.ArgumentException: The kernel name or alias 'fsharp' is already in use.

[amoghmc]

This is a related to the below pull request:
#6283

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.39%. Comparing base (3107855) to head (4805de1).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6309       +/-   ##
===========================================
- Coverage   80.99%   53.39%   -27.60%     
===========================================
  Files         237      106      -131     
  Lines       18198     3118    -15080     
  Branches        0      406      +406     
===========================================
- Hits        14739     1665    -13074     
+ Misses       3459     1180     -2279     
- Partials        0      273      +273     

Flag	Coverage Δ
unittests	53.39% <ø> (-27.60%)	⬇️

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