OpenFeature: Update authenticated request check (#108539)

pkg/registry/apis/ofrep/register.go

@@ -319,7 +319,7 @@ func (b *APIBuilder) isAuthenticatedRequest(r *http.Request) bool {
 	if !ok {
 		return false
 	}
-	return user.GetIdentityType() != ""
+	return user.GetIdentityType() != types.TypeUnauthenticated
 }
 
 // validateNamespace checks if the namespace in the evaluation context matches the namespace in the request