Remove before-after + fix header label (#9932)

- Fix header label on step

Before
<img width="224" alt="Capture d’écran 2025-01-30 à 12 11 27"
src="https://github.com/user-attachments/assets/e04e2d83-2414-4a92-a307-159e1ca16c64"
/> <img width="224" alt="Capture d’écran 2025-01-30 à 13 27 40"
src="https://github.com/user-attachments/assets/72e2c567-7ee0-43ff-9ae2-898e46d677c1"
/>

After
<img width="224" alt="Capture d’écran 2025-01-30 à 13 29 00"
src="https://github.com/user-attachments/assets/e7e458ab-458d-4e84-98a2-63596f44e0e7"
/> <img width="224" alt="Capture d’écran 2025-01-30 à 13 29 25"
src="https://github.com/user-attachments/assets/df1b0cbd-c8f2-44f6-b2f6-944e5ec8e14f"
/>



- Remove before - after when there is only one of them

packages/twenty-server/src/modules/workflow/workflow-builder/utils/generate-fake-object-record-event.ts

@@ -46,11 +46,9 @@ export const generateFakeObjectRecordEvent = (
   if (action === DatabaseEventAction.CREATED) {
     return {
       ...baseResult,
-      properties: {
+      'properties.after': {
         isLeaf: false,
-        value: {
-          after: { isLeaf: false, value: after, label: 'After Creation' },
-        },
+        value: after,
         label: 'Record Fields',
       },
     };
@@ -75,11 +73,9 @@ export const generateFakeObjectRecordEvent = (
   if (action === DatabaseEventAction.DELETED) {
     return {
       ...baseResult,
-      properties: {
+      'properties.before': {
         isLeaf: false,
-        value: {
-          before: { isLeaf: false, value: before, label: 'Before Deletion' },
-        },
+        value: before,
         label: 'Record Fields',
       },
     };
@@ -88,15 +84,9 @@ export const generateFakeObjectRecordEvent = (
   if (action === DatabaseEventAction.DESTROYED) {
     return {
       ...baseResult,
-      properties: {
+      'properties.before': {
         isLeaf: false,
-        value: {
-          before: {
-            isLeaf: false,
-            value: before,
-            label: 'Before Permanent Deletion',
-          },
-        },
+        value: before,
         label: 'Record Fields',
       },
     };