Mark email transport webhook endpoint as private (#3823)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v2/openapi.yaml

@@ -885,7 +885,6 @@ public class ApiClient {
           put("v2.triggerDeploymentGatesEvaluation", false);
           put("v2.updateDeploymentGate", false);
           put("v2.updateDeploymentRule", false);
-          put("v2.createEmailTransportWebhookIntake", false);
           put("v2.createHamrOrgConnection", false);
           put("v2.getHamrOrgConnection", false);
           put("v2.createGlobalIncidentHandle", false);