Page layout refactoring (#14535)

In this PR:
- Refactored the page layout renderer
- Converted all the states to component states
- Removed the page layout edition in settings

TODOs in next PRs:
- Fix bug with the drag selector not taking the scroll into account to
display the dragged area
- Readd the tab edition in edit mode

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

@@ -0,0 +1,11 @@
+import { type TabLayouts } from '@/page-layout/types/tab-layouts';
+
+export const getEmptyTabLayout = (
+  allTabLayouts: TabLayouts,
+  tabId: string,
+): TabLayouts => {
+  return {
+    ...allTabLayouts,
+    [tabId]: { desktop: [], mobile: [] },
+  };
+};