chore: fix nolintlint issues

[alexandear]

The PR enables nolintlint linter and fixes up appeared issues.

Changes:

• Enable nolintlint in .golangci.yml config.
• Remove unused //nolint: comments.
• Fix nolint comment format by removing spaces (// nolint: dupl -> //nolint:dupl)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.81%. Comparing base (c68d830) to head (328f5fe).
Report is 261 commits behind head on main.

❗ Current head 328f5fe differs from pull request most recent head 93783a7. Consider uploading reports for the commit 93783a7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4854      +/-   ##
==========================================
+ Coverage   83.77%   83.81%   +0.03%     
==========================================
  Files         135      139       +4     
  Lines       13029    11232    -1797     
==========================================
- Hits        10915     9414    -1501     
+ Misses       1677     1355     -322     
- Partials      437      463      +26     

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[caarlos0]

thanks!