test(node-native): Increase worker block timeout (#18683)

I saw this test flake (doesn't happen a lot but still). I had a quick
look at the integration and one idea I had is that maybe sometimes the
worker thread blocks before the watchdog is ready and that the thread
therefore never gets detected. So here I just increase the timeout
before blocking to see if that helps (let me know if that doesn't make
any sense).

Closes #18688

Author: nicohrubec

dev-packages/node-integration-tests/suites/thread-blocked-native/worker-block.mjs

@@ -2,4 +2,4 @@ import { longWork } from './long-work.js';
 
 setTimeout(() => {
   longWork();
-}, 2000);
+}, 5000);