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-server/src/engine/workspace-cache/types/workspace-cache-key.type.ts

@@ -36,6 +36,7 @@ export const WORKSPACE_CACHE_KEYS_V2 = {
   flatAgentMaps: 'flat-maps:agent',
   flatSkillMaps: 'flat-maps:skill',
   flatCommandMenuItemMaps: 'flat-maps:command-menu-item',
+  flatNavigationMenuItemMaps: 'flat-maps:navigation-menu-item',
   flatRoleTargetByAgentIdMaps: 'flat-maps:flatRoleTargetByAgentId',
   flatPageLayoutMaps: 'flat-maps:page-layout',
   flatPageLayoutWidgetMaps: 'flat-maps:page-layout-widget',