fix: enable thelper linter in client directory

[mmorel-35]

enables and fixes thelper linter issues in client directory

[k8s-ci-robot]

Hi @mmorel-35. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.83%. Comparing base (6779a89) to head (30f4e57). Report is 2 commits behind head on main.

:exclamation: Current head 30f4e57 differs from pull request most recent head 97c8869

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Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/expect/expect.go	79.12% <100.00%> (ø)

... and 28 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18746      +/-   ##
==========================================
+ Coverage   68.78%   68.83%   +0.04%     
==========================================
  Files         420      420              
  Lines       35481    35485       +4     
==========================================
+ Hits        24407    24425      +18     
+ Misses       9647     9633      -14     
  Partials     1427     1427              

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[ivanvc]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, jmhbnz, mmorel-35

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