Introduce `NormalizeCertificationType` method to ensure consistent handling of certification types across the application. Update `CreateEnvelopeCommandHandler`, `CreateEnvelopeWizardPopup.razor`, and `SenderEditorPage.razor` to use this method. Modify `CertificationType` enum to include `ElectronicSignature` and remove `QualifiedSignature`. Update UI components to reflect these changes by removing the `QualifiedSignature` option.
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