Don't recompute output schema when moving trigger (#16061)

Position changes don't affect the trigger's output schema, so
recomputing it is unnecessary. For webhook triggers specifically, the
backend can't reconstruct the schema (it returns `{}`), which overwrites
the frontend-built schema from `expectedBody`. Passing `{
computeOutputSchema: false }` prevents this data loss while avoiding
wasteful computation.

## Demo


https://github.com/user-attachments/assets/116af221-0d09-4dda-ad40-3301fa610bcd

Closes https://github.com/twentyhq/twenty/issues/15982

packages/twenty-front/src/modules/workflow/workflow-diagram/components/WorkflowDiagramCanvasEditable.tsx

@@ -132,10 +132,13 @@ export const WorkflowDiagramCanvasEditable = () => {
     const triggerToUpdate = workflowWithCurrentVersion?.currentVersion?.trigger;
 
     if (isDefined(triggerToUpdate)) {
-      await updateTrigger({
-        ...triggerToUpdate,
-        position: node.position,
-      });
+      await updateTrigger(
+        {
+          ...triggerToUpdate,
+          position: node.position,
+        },
+        { computeOutputSchema: false },
+      );
 
       return;
     }