build: drop @types/webpack-env in favor of webpack/module types (#47798)

* build: drop @types/webpack-env in favor of webpack/module types

* chore: improve type when assigning to global.require

typings/internal-ambient.d.ts

@@ -1,3 +1,5 @@
+/// <reference types="webpack/module" />
+
 declare const BUILDFLAG: (flag: boolean) => boolean;
 
 declare namespace NodeJS {