701 workflow improve webhook triggers (#11455)

as title

Nota bene: I did not filter execution by http method. A POST webhook
trigger can be triggered by a GET request for more flexibility. Tell me
if you think it is a mistake


https://github.com/user-attachments/assets/1833cbea-51a8-4772-bcd8-088d6a087e79

packages/twenty-server/src/modules/workflow/workflow-trigger/types/workflow-trigger.type.ts

@@ -61,6 +61,16 @@ export type WorkflowCronTrigger = BaseTrigger & {
 
 export type WorkflowWebhookTrigger = BaseTrigger & {
   type: WorkflowTriggerType.WEBHOOK;
+  settings:
+    | {
+        httpMethod: 'GET';
+        authentication: 'API_KEY' | null;
+      }
+    | ({
+        httpMethod: 'POST';
+        authentication: 'API_KEY' | null;
+        expectedBody: object;
+      } & { outputSchema: object });
 };
 
 export type WorkflowManualTriggerSettings = WorkflowManualTrigger['settings'];