chore: enable thelper linter

[mmorel-35]

Description

enables and fixes thelper linter issues.

Notice that only naming rules are activated here.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorel-35
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[codecov]

Codecov Report

Attention: Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 68.76%. Comparing base (8731c31) to head (168f7db).

Files with missing lines	Patch %	Lines
server/storage/wal/testing/waltesting.go	46.66%	8 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/backend/testing/betesting.go	87.50% <100.00%> (ø)
server/storage/wal/testing/waltesting.go	60.86% <46.66%> (ø)

... and 22 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19271      +/-   ##
==========================================
- Coverage   68.85%   68.76%   -0.10%     
==========================================
  Files         420      420              
  Lines       35680    35680              
==========================================
- Hits        24569    24534      -35     
- Misses       9689     9726      +37     
+ Partials     1422     1420       -2     

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