golangci-lint: enable and fix thelper linter

[mmorel-35]

Please add a summary of your change

enable and fix thelper linter

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.

[mmorel-35]

/kind changelog-not-required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.19%. Comparing base (c6264ff) to head (226a4c1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8314   +/-   ##
=======================================
  Coverage   59.19%   59.19%           
=======================================
  Files         367      367           
  Lines       30849    30849           
=======================================
  Hits        18262    18262           
  Misses      11125    11125           
  Partials     1462     1462           

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[shubham-pampattiwar]

Thank you @mmorel-35 ! /lgtm