[RELEASE-1.15] Fix deepcopy gen

[skonto]

Fixes #

Proposed Changes

• See Fix deepcopy gen #15492 (review)
• I tested by deleting all zz_* files find ./pkg -type f -name 'zz*.go' | xargs rm.
• No need to migrate to the new kube code gen thingy I think. Goal is to fix that generated file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.53%. Comparing base (038a181) to head (db31847).
Report is 1 commits behind head on release-1.15.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.15   #15493   +/-   ##
=============================================
  Coverage         84.52%   84.53%           
=============================================
  Files               219      219           
  Lines             13595    13595           
=============================================
+ Hits              11491    11492    +1     
  Misses             1735     1735           
+ Partials            369      368    -1     

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[dsimansk]

/approve
/lgtm

[knative-prow]

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