test: deflake process timeout report cleanup

The grandchild can briefly outlive the timed-out process while it waits
to detect its parent's exit. Give it a working directory outside the
test's temporary directory so it does not block cleanup on Windows.

Signed-off-by: Filip Skokan <panva.ip@gmail.com>
Assisted-by: Codex
PR-URL: #66428
Reviewed-By: Stefan Stojanovic <stefan.stojanovic@janeasystems.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: panva

test/fixtures/process-timeout/blocked-worker.js

@@ -10,6 +10,9 @@ const script = path.join(__dirname, 'wait-for-parent.js');
 const args = [script, String(process.pid), process.argv[2]];
 new Worker(`
   require('child_process').execFileSync(process.execPath, ${JSON.stringify(args)}, {
+    // The child can briefly outlive the parent. Do not keep the test's
+    // temporary directory open, which prevents cleanup on Windows.
+    cwd: ${JSON.stringify(__dirname)},
     stdio: 'ignore',
   });
 `, { eval: true, name: 'blocked' });