[Ongoing] Find & mark non-deterministic environments

HTML and JavaScript are never meant to be run deterministically (or even synchronously), same story with web browsers. As a result, web-based MiniWoB++ suffer from determinism issues. Some are due to bugs in script, others are sort of inevitable.

If you find any non-deterministic environments, please share it via replying to this issue, and we would investigate & mark the environment as a non-deterministic one. It would be helpful to provide observation dumps or any other useful debug info, but just having the name is enough.

Relevant pull requests:
- #116
- #118

### Checklist

- [x] I have checked that there is no similar [issue](https://github.com/Farama-Foundation/miniwob-plusplus/issues) in the repo (**required**)

Review the web-based MiniWoB++ environments and investigate whether their behavior is reproducible across runs. Share the environment name with observation dumps or other useful debug information; done means the issue has been investigated and the environment is marked as non-deterministic when appropriate.

Written by the indexing model from the issue text.