Airflow names child runs from TriggerDagRunOperator "triggered_from"

### Description Airflow names child runs from TriggerDagRunOperator as manual__..., even though no person manually started that backfill. It would be great if they can have a more detailed naming. ### Use case/motivation _No response_ ### 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)