🧹 Dedup code by using client-pkg

[cardil]

Changes

• 🧹 Dedup code by using client-pkg

Reference

Fixes knative-extensions/kn-plugin-event#282

[knative-prow]

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[cardil]

/hold

Wait for knative/client-pkg#177

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.03%. Comparing base (cbb6f5c) to head (d993c96).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1935      +/-   ##
==========================================
+ Coverage   74.58%   78.03%   +3.45%     
==========================================
  Files         207      141      -66     
  Lines       15567     8770    -6797     
==========================================
- Hits        11611     6844    -4767     
+ Misses       3167     1271    -1896     
+ Partials      789      655     -134     

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PR needs rebase.

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[cardil]

/hold
/cc @dsimansk
/cc @mvinkler

I think, I'll reconsider this in favor of another idea - to integrate all client code within knative/client itself, but with go modules. Probably some changes are needed for the release script, and some adjustment for Go 1.22 vendor changes, see: golang/go#60056