Fix deprecated client-pkg in favor of knative.dev/client/pkg

[dsimansk]

Changes

• Fix deprecated client-pkg in favor of knative.dev/client/pkg

Fixing tech debt.

/cc @skonto

[knative-prow]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 27 lines in your changes missing coverage. Please review.

Project coverage is 72.78%. Comparing base (aeb1784) to head (c39dd38).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
test/e2e/common.go	0.00%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #365      +/-   ##
==========================================
- Coverage   78.03%   72.78%   -5.25%     
==========================================
  Files          27       28       +1     
  Lines        1525     1635     +110     
==========================================
  Hits         1190     1190              
- Misses        272      382     +110     
  Partials       63       63              

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[dsimansk]

/override "codecov/patch"
/override "codecov/project"

[knative-prow]

@dsimansk: Overrode contexts on behalf of dsimansk: codecov/patch, codecov/project

In response to this:

/override "codecov/patch"
/override "codecov/project"

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