process: disallow adding options to process.allowedNodeEnvironmentFlags

Make no-op direct calls of `Set` prototype methods to
`process.allowedNodeEnvironmentFlags`.

```js
const { add } = Set.prototype;
add.call(process.allowedNodeEnvironmentFlags, '--user-option`);
process.allowedNodeEnvironmentFlags.has('--user-option') === false;
```

PR-URL: https://github.com/nodejs/node/pull/36660


Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>