360 workflow implement workflow cron triggers frontend 2 (#10051)

as title, closes https://github.com/twentyhq/core-team-issues/issues/360

## Cron Setting behavior

https://github.com/user-attachments/assets/0de3a8b9-d899-4455-a945-20c7541c3053

## Cron running behavior


https://github.com/user-attachments/assets/4c33f167-857c-4fcb-9dbe-0f9b661c9e61

packages/twenty-server/src/modules/workflow/workflow-builder/workflow-builder.workspace-service.ts

@@ -59,6 +59,9 @@ export class WorkflowBuilderWorkspaceService {
           objectMetadataRepository: this.objectMetadataRepository,
         });
       }
+      case WorkflowTriggerType.CRON: {
+        return {};
+      }
       case WorkflowActionType.SEND_EMAIL: {
         return this.computeSendEmailActionOutputSchema();
       }