8726 workflow add a test button in workflow code step (#9016)

- add test button to workflow code step
- add test tab to workflow code step


https://github.com/user-attachments/assets/e180a827-7321-49a2-8026-88490c557da2



![image](https://github.com/user-attachments/assets/cacbd756-de3f-4141-a84c-8e1853f6556b)

![image](https://github.com/user-attachments/assets/ee170d81-8a22-4178-bd6d-11a0e8c73365)

packages/twenty-front/src/modules/workflow/components/WorkflowStepBody.tsx

@@ -0,0 +1,12 @@
+import styled from '@emotion/styled';
+
+const StyledWorkflowStepBody = styled.div`
+  display: flex;
+  flex-direction: column;
+  overflow-y: scroll;
+  padding: ${({ theme }) => theme.spacing(6)};
+  row-gap: ${({ theme }) => theme.spacing(6)};
+  flex: 1 1 auto;
+`;
+
+export { StyledWorkflowStepBody as WorkflowStepBody };