feat(ci): add custom linter to prevent stuttering in pkg paths

[rubenhoenle]

Description

relates to #1234

Checklist

• Issue was linked above
• No generated code was adjusted manually (check comments in file header)
• Changelogs
  • Changelog in the root directory was adjusted (see here)
  • Changelog(s) of the service(s) were adjusted (see e.g. here)
• VERSION file(s) of the service(s) were adjusted
• Code format was applied: make fmt
• Examples were added / adjusted (see examples/ directory)
• Unit tests got implemented or updated
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[rubenhoenle]

Failing pipline maybe related to

golangci/golangci-lint#6205
golangci/golangci-lint#6206
golangci/golangci-lint@101ccac

[github-actions]

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