Consistent language for backfill reprocessing options

### What do you see as an issue? In the current 3.0 beta, backfills in the UI use `missing, missing + errored, all` for reprocessing behavior options. But current main docs and it appears the CLI use `none, failed, completed`. Ideally the UI, CLI, and API should all use the same language for the user. `missing, missing + errored, all` is likely to cause the least amount of confusion. ### Solving the problem _No response_ ### Anything else _No response_ ### Are you willing to submit 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)