chore: enable thelper linter

[mmorel-35]

Description

enables and fixes thelper linter issues.

Notice that only naming rules are activated here.

[codecov]

Codecov Report

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

Project coverage is 68.86%. Comparing base (488f215) to head (9f5e57e).

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 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19271      +/-   ##
==========================================
+ Coverage   68.84%   68.86%   +0.02%     
==========================================
  Files         420      420              
  Lines       35693    35693              
==========================================
+ Hits        24572    24581       +9     
+ Misses       9705     9687      -18     
- Partials     1416     1425       +9     

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[ahrtr]

Please rebase this PR, thx

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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