worker: add test for env option when using process-only cli flag

It should be possible to pass the `env` option to a worker
even when the parent process is using a process-level flag, such
as `--title` or a V8-specific flag.

This test is currently failing in Node.js 22.2.0

test/parallel/test-worker-env-option-with-v8-cli-flags.js

@@ -0,0 +1,9 @@
+// Flags: --expose_gc
+'use strict';
+require('../common');
+const { Worker } = require('worker_threads');
+
+// Test that it does not crash
+new Worker('', { eval: true, env: {} });
+new Worker('', { eval: true, env: process.env });
+new Worker('', { eval: true, env: { HELLO: 'hi!' } });