chore: upgrade go version, add tests and comments, and fix arg names

[MeNsaaH]

• add extra tests
• add some comments to function
• fix args spelling error max-concurrenct-checks -> max-concurrent-checks
• Add namespace to generated-store -> kubepug-generated-store
• Fix golang-ci lint issues by running golangci-lint run --fix and also manually fixing other cases.

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pkg/kustomize/process.go:50

• Switching the logging level from Info to Debug may reduce the visibility of directory processing logs in production. Please confirm that this change is intentional for operational monitoring.

log.Debug().Msgf("processing directory %q", relBase)

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pkg/argo_client/kustomize.go:38

• The use of log.Printf for error logging is inconsistent with the rest of the codebase that uses zerolog. Consider using log.Error().Err(err).Msg(...) for consistency.

defer func() { if err := r.Close(); err != nil { log.Printf("failed to close file: %v", err) } }() // ignore error: file was opened read-only.

pkg/config/config.go:88

• Despite updating the mapstructure tag, the internal field name 'MaxConcurrenctChecks' remains misspelled. Consider renaming it to 'MaxConcurrentChecks' for clarity and consistency.

MaxConcurrenctChecks     int           `mapstructure:"max-concurrent-checks"`

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pkg/checks/preupgrade/kubepug.go:54

• The format specifier '%b' converts the index 'i' into its binary representation; if a decimal representation is intended, consider using '%d' instead.

tmpFile := fmt.Sprintf("%s/%b.yaml", tempDir, i)