fix(navigation-menu v4): 6888 - Remove "use client" directive (#6913)

Removes unnecessary "use client" directive from navigation menu components to simplify the code and avoid potential issues.

Co-authored-by: shadcn <m@shadcn.com>

apps/v4/components/navigation-menu-demo.tsx

@@ -1,5 +1,3 @@
-"use client"
-
 import * as React from "react"
 import Link from "next/link"
 import { CircleCheckIcon, CircleHelpIcon, CircleIcon } from "lucide-react"

apps/v4/registry/new-york-v4/ui/navigation-menu.tsx

@@ -1,5 +1,3 @@
-"use client"
-
 import * as React from "react"
 import * as NavigationMenuPrimitive from "@radix-ui/react-navigation-menu"
 import { cva } from "class-variance-authority"