Normalize certification type handling

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.

EnvelopeGenerator.Domain/Constants/CertificationType.cs

@@ -2,8 +2,7 @@
 {
     public enum CertificationType
     {
-        AdvancedElectronicSignature = 1
-        // ElectronicSignature = 1
-        // QualifiedSignature = 2
+        AdvancedElectronicSignature = 1,
+        ElectronicSignature = 2
     }
-}
+}