Add record page layout tabs editing (#18702)

- Fix duplication of tabs in dashboards that didn't open the duplicated
tab in the side panel: replaced the logic that used Math.round with an
algorithm that switches the positions of the elements. We will keep
relying on integers, but it will work well in all cases.
- Make dnd work with record page layouts, where there is a pinned tab
- Make tab movements work with pinned tab, too
- Allow user to set a tab as the pinned tab
- Make backend changes to be able to save tabs with `layoutMode`



https://github.com/user-attachments/assets/ce1130fa-71df-49ba-ba2f-6f971e15dd49

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

packages/twenty-front/src/modules/page-layout/utils/convertPageLayoutDraftToUpdateInput.ts

@@ -49,6 +49,7 @@ export const convertPageLayoutDraftToUpdateInput = (
       id: tab.id,
       title: tab.title,
       position: tab.position,
+      layoutMode: tab.layoutMode,
       widgets: tab.widgets
         .filter((widget) => !isDynamicRelationWidget(widget))
         .map((widget, widgetIndex) => ({