koord-manager: fix repeated accumulation of node GPU resources

[eahydra]

Ⅰ. Describe what this PR does

koord-manager: fix repeated accumulation of node GPU resources

Ⅱ. Does this pull request fix one issue?

fix #1147

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

[jasonliu747]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jasonliu747

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (b7d7a45) 66.77% compared to head (471c8b7) 66.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1149      +/-   ##
==========================================
+ Coverage   66.77%   66.81%   +0.04%     
==========================================
  Files         271      271              
  Lines       29603    29606       +3     
==========================================
+ Hits        19766    19782      +16     
+ Misses       8425     8416       -9     
+ Partials     1412     1408       -4     

Flag	Coverage Δ
unittests	66.81% <100.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...troller/noderesource/device_resource_calculator.go	59.32% <100.00%> (+4.53%)	⬆️

... and 2 files with indirect coverage changes

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