fix MessageChannel is not defined in encodeInto.any.js

wpt runner import MessageChannel, fix MessageChannel is not defined in encodeInto.any.js.

Fixes: nodejs#28851

Author: AtticusYang

test/wpt/test-encoding.js

@@ -3,10 +3,17 @@
 // Flags: --expose-internals
 
 require('../common');
+const { MessageChannel } = require('worker_threads');
 const { WPTRunner } = require('../common/wpt');
 const runner = new WPTRunner('encoding');
 
 // Copy global descriptors from the global object
 runner.copyGlobalsFromObject(global, ['TextDecoder', 'TextEncoder']);
 
+runner.defineGlobal('MessageChannel', {
+  get() {
+    return MessageChannel;
+  }
+});
+
 runner.runJsTests();