* Navigation: Start creating new NavBarMenu component
* Navigation: Apply new NavBarMenu to NavBarNext
* Navigation: Remove everything to do with .sidemenu-open--xs
* Navigation: Ensure search is passed to NavBarMenu
* Navigation: Standardise NavBarMenuItem
* This extra check isn't needed anymore
* Navigation: Refactor <li> out of NavBarMenu
* Navigation: Combine NavBarMenuItem with DropdownChild
* use spread syntax since performance shouldn't be a concern for such small arrays
* Improve active item logic
* Ensure unique keys
* Remove this duplicate code
* Add unit tests for getActiveItem
* Add tests for NavBarMenu
* Rename mobileMenuOpen -> menuOpen in NavBarNext (since it can be used for mobile menu or megamenu)
* just use index to key the items
* Use exact versions of @react-aria packages
* Navigation: Make the dropdown header a NavBarMenuItem
* Navigation: Stop using dropdown-menu for styles
* Navigation: Hide divider in NavBarMenu + tweak color on section header