🌱 (chore): consistently wrap and enrich error messages across helm plugin

[kersten]

This change updates several Helm plugin files to ensure consistent use of error wrapping via fmt.Errorf with %w. This improves debugging and traceability by providing more context when errors occur, especially in scenarios involving file I/O and scaffolding.

The goal is to enforce best practices across the codebase for error handling, making logs and failure points easier to diagnose.

No functional changes are introduced—this is purely an internal consistency and developer experience improvement.

[k8s-ci-robot]

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[camilamacedo86]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, kersten

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