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
b309815700. 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>
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