chore: use kube_codegen.sh instead in codegen.

[xdevxy]

make codegen has the following warning,

WARNING: generate-internal-groups.sh is deprecated.
WARNING: Please use k8s.io/code-generator/kube_codegen.sh instead.

which can cause similar permission denied issue as numaproj/numaplane#214

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.83%. Comparing base (8fc99bb) to head (3c55904).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2011      +/-   ##
==========================================
- Coverage   61.85%   61.83%   -0.03%     
==========================================
  Files         318      318              
  Lines       28979    28979              
==========================================
- Hits        17924    17918       -6     
- Misses      10098    10114      +16     
+ Partials      957      947      -10     

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[kohlisid]

Hey @xdevxy
Just curios did any other things change along with the script if you have taken a look into that?
Otherwise I would do a spike on that just to understand the transition a bit better