🧹 Dedup knative/client code by using knative/client-pkg

[cardil]

Changes

• 🧹 Dedup knative/client code by using knative/client-pkg

/kind cleanup

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

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[codecov]

Codecov Report

Attention: Patch coverage is 65.97052% with 277 lines in your changes are missing coverage. Please review.

Project coverage is 59.67%. Comparing base (2dec068) to head (a64cce1).
Report is 6 commits behind head on main.

❗ Current head a64cce1 differs from pull request most recent head fe59266. Consider uploading reports for the commit fe59266 to get more accurate results

Files	Patch %	Lines
pkg/util/test/revision.go	0.00%	77 Missing ⚠️
pkg/commands/completion_helper.go	87.68%	18 Missing and 16 partials ⚠️
pkg/util/test/broker.go	0.00%	30 Missing ⚠️
pkg/util/test/subscription.go	0.00%	30 Missing ⚠️
pkg/util/test/channel.go	0.00%	29 Missing ⚠️
pkg/util/test/eventtype.go	0.00%	24 Missing ⚠️
pkg/flags/podspec_helper.go	0.00%	20 Missing ⚠️
pkg/commands/types.go	46.66%	8 Missing ⚠️
pkg/serving/v1/client_mock.go	93.27%	7 Missing and 1 partial ⚠️
pkg/commands/flags/sink/flag.go	74.07%	5 Missing and 2 partials ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   57.62%   59.67%   +2.05%     
==========================================
  Files         114      127      +13     
  Lines        8418     7934     -484     
==========================================
- Hits         4851     4735     -116     
+ Misses       3303     2910     -393     
- Partials      264      289      +25     

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[knative-prow-robot]

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