Eliminated the utcDataService and signatureService parameters from the SecuredOnboardingService constructor as they were no longer in use. This cleanup helps streamline the code and improve readability.

Renamed OnboardRevokeExceptionBase to OnboardRevokeOrVerifyExceptionBase to better reflect its purpose. Updated all derived exception classes to inherit from the new base class.

Replaced the detailed switch-case error handling with a more concise deserialization of error responses using OnboardErrorResponse class. This change improves readability and maintainability by centralizing error message construction within the OnboardException.