ci: update golangci-lint, add pre-commit, fix lints

[TylerGillson]

Issue

Description

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   49.45%   49.66%   +0.20%     
==========================================
  Files          20       20              
  Lines        1203     1206       +3     
==========================================
+ Hits          595      599       +4     
+ Misses        542      540       -2     
- Partials       66       67       +1     

Files	Coverage Δ
api/v1alpha1/validationresult_types.go	72.22% <100.00%> (ø)
internal/controller/validatorconfig_controller.go	72.09% <100.00%> (+0.99%)	⬆️
pkg/helm/secrets.go	56.66% <100.00%> (ø)
pkg/helm/helm.go	41.37% <33.33%> (-1.79%)	⬇️

... and 1 file with indirect coverage changes

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