Migrate to kube_gen

[matzew]

As per title

@creydr please take a look

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.91%. Comparing base (49223dd) to head (9a8bedd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #550   +/-   ##
=======================================
  Coverage   25.91%   25.91%           
=======================================
  Files          34       34           
  Lines        1204     1204           
=======================================
  Hits          312      312           
  Misses        884      884           
  Partials        8        8           

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[creydr]

/lgtm