refactor: replace reinvented wheel with Get() in standard library

[jasonliu747]

Signed-off-by: Jason Liu jasonliu747@gmail.com

Ⅰ. Describe what this PR does

[codecov]

Codecov Report

Merging #244 (63d8cf8) into main (5d624d7) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
- Coverage   58.40%   58.37%   -0.04%     
==========================================
  Files         103      103              
  Lines        9582     9575       -7     
==========================================
- Hits         5596     5589       -7     
  Misses       3521     3521              
  Partials      465      465              

Flag	Coverage Δ
unittests	58.37% <100.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
pkg/koordlet/audit/auditor.go	71.42% <100.00%> (-1.15%)	⬇️

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[eahydra]

/lgtm

[hormes]

/approve

[koordinator-bot]

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