scheduler: rename leastRequestedScore func

[googs1025]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

• leastRequestedScore func name seems to be misleading, we use used for calculation, not requested

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.02%. Comparing base (b20dca2) to head (bf75ef8).
Report is 70 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2422   +/-   ##
=======================================
  Coverage   66.01%   66.02%           
=======================================
  Files         470      470           
  Lines       55561    55561           
=======================================
+ Hits        36679    36682    +3     
+ Misses      16233    16228    -5     
- Partials     2649     2651    +2     

Flag	Coverage Δ
unittests	66.02% <100.00%> (+<0.01%)	⬆️

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[saintube]

/lgtm

[koordinator-bot]

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