feat: add User-Agent with Puppeteer version to WebSocket request (#5614)

This will add the User-Agent header to WebSocket requests.

src/node/NodeWebSocketTransport.ts

@@ -18,11 +18,16 @@ import NodeWebSocket from 'ws';
 
 export class NodeWebSocketTransport implements ConnectionTransport {
   static create(url: string): Promise<NodeWebSocketTransport> {
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const pkg = require('../../../../package.json');
     return new Promise((resolve, reject) => {
       const ws = new NodeWebSocket(url, [], {
         followRedirects: true,
         perMessageDeflate: false,
         maxPayload: 256 * 1024 * 1024, // 256Mb
+        headers: {
+          'User-Agent': `Puppeteer ${pkg.version}`,
+        },
       });
 
       ws.addEventListener('open', () =>