dagProcessor in helm chart doesn't have a labels section

### Description All other parts of the helm chart have a labels section specific to the workload except for the dagProcessor. Can one be added please? ### Use case/motivation I'd like the dagProcessor to have labels ### 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)