Parameterise key sorting in "Rendered Template" view

### Description Currently the https://github.com/apache/airflow/blob/main/airflow/www/views.py#L1254 has forceful sorting by keys. It'd be very nice to have this behaviour parameterised and not hardcoded ### Use case/motivation Sometimes we have big templates with few nested levels and it's very inconvenient to see higher level keys scattered across few screens located at the very bottom of template despite initially it was on the very start just because it was sorted by key forcefully. ### Related issues _No response_ ### Are you willing to submit a PR? - [ ] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)