koord-descheduler: fix migration controller max unavailable computing algorigthm

[songtao98]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

fixes #2195

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

[koordinator-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.69%. Comparing base (aacf585) to head (9f609ad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2196      +/-   ##
==========================================
- Coverage   67.72%   67.69%   -0.03%     
==========================================
  Files         446      446              
  Lines       42695    42697       +2     
==========================================
- Hits        28916    28905      -11     
- Misses      11258    11268      +10     
- Partials     2521     2524       +3     

Flag	Coverage Δ
unittests	67.69% <100.00%> (-0.03%)	⬇️

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[songtao98]

/hold

[songtao98]

/unhold

[hormes]

/lgtm
/approve