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 68.83%. Comparing base (a2eedb9) to head (d05a17a).
Report is 2 commits behind head on main.

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 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19271      +/-   ##
==========================================
- Coverage   68.89%   68.83%   -0.07%     
==========================================
  Files         421      421              
  Lines       35897    35897              
==========================================
- Hits        24733    24711      -22     
- Misses       9740     9757      +17     
- Partials     1424     1429       +5     

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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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