Improve create-link error handling

[Quentin-David-24]

Improve error message for create-link and update-link operations when the Payment Service User (PSU) has not been forwarded to the connector.

Previously, calling create-link or update-link without a pre-forwarded PSU resulted in a generic "not found" error. This change provides a specific error message guiding the user to first forward the PSU to the connector.

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Slack Thread

 

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Summary by cubic

Adds clear validation errors for create-link and update-link when the PSU hasn’t been forwarded to the connector, replacing the generic “not found” response. This guides users to forward the PSU before linking.

• Bug Fixes
  • Engine maps storage.ErrNotFound to a validation error with an actionable message for both create and update link flows.
  • Tests updated: unit tests assert the new error text; added an e2e test for create-link without a forwarded PSU.

^{Written for commit 06102d4. Summary will update automatically on new commits.}

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cursor/improve-create-link-error-handling-39a9

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