Update error handling

[jjngx]

Proposed changes

This PR updates error handling in the validation package.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

Merging #3936 (af53ba5) into main (1ae8a55) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3936      +/-   ##
==========================================
- Coverage   51.81%   51.81%   -0.01%     
==========================================
  Files          59       59              
  Lines       16697    16697              
==========================================
- Hits         8652     8651       -1     
  Misses       7747     7747              
- Partials      298      299       +1     

Impacted Files	Coverage Δ
pkg/apis/dos/validation/dos.go	97.27% <100.00%> (+2.72%)	⬆️

... and 1 file with indirect coverage changes

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