Link command menu items to specific page layout (#19706)

- Add a `pageLayoutId` foreign key to `CommandMenuItem`, allowing
command menu items to be scoped to a specific page layout instead of
being globally available
- Filter command menu items by the current page layout on the frontend.
Items with a `pageLayoutId` only appear when viewing that layout, while
items without one remain globally visible
- Create an effect to track the current page layout ID
- Include a seed example: a "Show Notification" command pinned to the
Star history standalone page layout

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Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/metadata-modules/flat-command-menu-item/constants/flat-command-menu-item-editable-properties.constant.ts

@@ -10,4 +10,5 @@ export const FLAT_COMMAND_MENU_ITEM_EDITABLE_PROPERTIES = [
   'availabilityType',
   'availabilityObjectMetadataId',
   'engineComponentKey',
+  'pageLayoutId',
 ] as const satisfies MetadataEntityPropertyName<'commandMenuItem'>[];