Optimize watch ignore (#52238)

## What?

Uses a pre-created regex instead of having webpack run path-to-regexp on the list of patterns. Saves a few milliseconds.
Adds `node_modules` to ignored in order to skip a lot of stat calls at the end of the compilation.

This will likely have a big impact on applications using Yarn PnP as each stat call causes a lookup through `.pnp.cjs`.

packages/next/src/build/webpack-config.ts

@@ -152,7 +152,9 @@ const nodePathList = (process.env.NODE_PATH || '')
 
 const watchOptions = Object.freeze({
   aggregateTimeout: 5,
-  ignored: ['**/.git/**', '**/.next/**'],
+  ignored:
+    // Matches **/node_modules/**, **/.git/** and **/.next/**
+    /^((?:[^/]*(?:\/|$))*)(\.(git|next)|node_modules)(\/((?:[^/]*(?:\/|$))*)(?:$|\/))?/,
 })
 
 function isModuleCSS(module: { type: string }) {