scheduler: fix shared gpu pod allocated minor of -1

[ZiMengSheng]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

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

[songtao98]

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.28%. Comparing base (ad7d395) to head (f08a115).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2230      +/-   ##
==========================================
+ Coverage   66.25%   66.28%   +0.02%     
==========================================
  Files         453      453              
  Lines       53160    53175      +15     
==========================================
+ Hits        35222    35247      +25     
+ Misses      15398    15390       -8     
+ Partials     2540     2538       -2     

Flag	Coverage Δ
unittests	66.28% <100.00%> (+0.02%)	⬆️

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