Enable funlen linter (part 4)

[brojeg]

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Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: 934

What is the new behavior?

Other information

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.88889% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 41.08%. Comparing base (b7a9b51) to head (59b3246).
Report is 106 commits behind head on master.

Files	Patch %	Lines
internal/credentials/oauth2.go	90.56%	3 Missing and 2 partials ⚠️
internal/credentials/static.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1224      +/-   ##
==========================================
+ Coverage   40.80%   41.08%   +0.28%     
==========================================
  Files         309      311       +2     
  Lines       32747    33141     +394     
==========================================
+ Hits        13361    13617     +256     
- Misses      18959    19062     +103     
- Partials      427      462      +35     

Flag	Coverage Δ
go-1.21.x	43.27% <88.88%> (+0.34%)	⬆️
go-1.22.x	41.06% <88.88%> (+0.27%)	⬆️
macOS	40.54% <86.66%> (+0.24%)	⬆️
ubuntu	40.59% <86.66%> (+0.29%)	⬆️
unit	41.08% <88.88%> (+0.28%)	⬆️
windows	41.05% <88.88%> (+0.26%)	⬆️

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[asmyasnikov]

I think tool gtrace no need to change because it is an ad-hoc tool

[asmyasnikov]

And the breaking action was broken with your PR - because you change a code of gtrace tool

[brojeg]

thank you for the review. I've rolled back [writer.go] and added //nolint:funlen where needed.