Fix: Add del modify leaderboard split and dataset split

[Harshit28j]

This PR fixes

1. Add/delete leaderboard split using the challenge configuration
2. Add/delete dataset split using the challenge configuration

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.30%. Comparing base (96968d6) to head (09686eb).
Report is 1110 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4394      +/-   ##
==========================================
- Coverage   72.93%   69.30%   -3.63%     
==========================================
  Files          83       20      -63     
  Lines        5368     3574    -1794     
==========================================
- Hits         3915     2477    -1438     
+ Misses       1453     1097     -356     

see 64 files with indirect coverage changes

see 64 files with indirect coverage changes

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