chore: enable sloglint

[jkroepke]

What this PR does / why we need it

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

• fixes #

Special notes for your reviewer

Particularly user-facing changes

Checklist

Complete these before marking the PR as ready to review:

• DCO signed
• The PR title has a summary of the changes
• The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.67%. Comparing base (1dc2a22) to head (693f350).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/oauth2/providers/generic/user.go	33.33%	4 Missing ⚠️
internal/oauth2/refresh.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #342      +/-   ##
==========================================
+ Coverage   82.50%   82.67%   +0.17%     
==========================================
  Files          50       50              
  Lines        3081     3083       +2     
==========================================
+ Hits         2542     2549       +7     
+ Misses        408      404       -4     
+ Partials      131      130       -1     

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