Add syncable NavigationMenuItem entity to core schema (#17232)

Implements a new syncable `navigationMenuItem` entity in the core schema
to replace the workspace `favorite` entity.

## Next Steps
- Frontend integration ([separate
PR](https://github.com/twentyhq/twenty/pull/17268))
- Data migration (separate PR)

packages/twenty-shared/src/metadata/all-metadata-name.constant.ts

@@ -21,5 +21,6 @@ export const ALL_METADATA_NAME = {
   pageLayoutWidget: 'pageLayoutWidget',
   pageLayoutTab: 'pageLayoutTab',
   commandMenuItem: 'commandMenuItem',
+  navigationMenuItem: 'navigationMenuItem',
   frontComponent: 'frontComponent',
 } as const;