[Question]: qenv.error probably doesn't make sense anymore

### What is your question?

https://github.com/insightsengineering/teal/pull/1357#discussion_r1841704759

After introducing decorators in teal.modules.general and teal.modules.clinical it doesn't make sense to handle `qenv.error` anymore (is it?). `qenv.error` was made to avoid shiny.error and to handle some things gracefully - to still be able to call `eval_code` or `get_code` without any strange errors (get_code(). We need to investigate if `qenv` still makes sense.

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct.

### Contribution Guidelines

- [x] I agree to follow this project's Contribution Guidelines.

### Security Policy

- [x] I agree to follow this project's Security Policy.