Deleted at improvement (#16732)

Disable Deactivate option for all standard fields

#16706 

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Prevents deactivation UI for standard system fields on the field edit
page.
> 
> - Introduces `canFieldBeDeactivated` to flag standard fields
(`createdAt`, `createdBy`, `deletedAt`, `updatedAt`)
> - Hides the "Danger zone" (deactivate/activate/delete controls) when
`!isLabelIdentifier && !readonly && !canFieldBeDeactivated`
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
b309815700555c8e0f28324936e4ddd313a24fb6. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>
Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/pages/settings/data-model/SettingsObjectFieldEdit.tsx

@@ -142,6 +142,17 @@ export const SettingsObjectFieldEdit = () => {
     objectMetadataItem: objectMetadataItem,
   });
 
+  const fieldNamesThatCannotBeDeactivated = [
+    'createdAt',
+    'createdBy',
+    'deletedAt',
+    'updatedAt',
+  ];
+
+  const fieldCanBeDeactivated = !fieldNamesThatCannotBeDeactivated.includes(
+    fieldMetadataItem.name,
+  );
+
   const handleSave = async (
     formValues: SettingsDataModelFieldEditFormValues,
   ) => {
@@ -372,7 +383,7 @@ export const SettingsObjectFieldEdit = () => {
               />
             </Section>
 
-            {!isLabelIdentifier && !readonly && (
+            {!isLabelIdentifier && !readonly && fieldCanBeDeactivated && (
               <Section>
                 <H2Title
                   title={t`Danger zone`}