Allow json in workflow run's error field (#12762)

We can now inspect errors even if they contain complex data as objects.
Only the first line of the error is put in red.



![CleanShot 2025-06-20 at 18 31
54@2x](https://github.com/user-attachments/assets/a3fd41fb-0063-4fe1-8185-54137c2a0d6e)


![image](https://github.com/user-attachments/assets/833a2851-e7d5-4985-9e42-07a1899cd3de)

packages/twenty-front/src/modules/workflow/validation-schemas/workflowSchema.ts

@@ -271,7 +271,7 @@ export const workflowTriggerSchema = z.discriminatedUnion('type', [
 // Step output schemas
 export const workflowExecutorOutputSchema = z.object({
   result: z.any().optional(),
-  error: z.string().optional(),
+  error: z.any().optional(),
   pendingEvent: z.boolean().optional(),
 });
 
@@ -286,7 +286,7 @@ export const workflowRunOutputSchema = z.object({
     steps: z.array(workflowActionSchema),
   }),
   stepsOutput: workflowRunOutputStepsOutputSchema.optional(),
-  error: z.string().optional(),
+  error: z.any().optional(),
 });
 
 export const workflowRunContextSchema = z.record(z.any());