Add more typing to airflow.utils.helpers (#15582)
Add more typing to airflow.utils.helpers (#15582)

* Add more typing to airflow.utils.helpers

* Apply suggestions from code review

Co-authored-by: Tzu-ping Chung <2e53b0ad3dd47d6e307c848b4062b6f9b074f9b0@gmail.com>

* Update airflow/utils/helpers.py

* Update airflow/utils/helpers.py

Co-authored-by: Xiaodong DENG <88c52341fa08274ad1da50d9b97f03e6c2a64b73@gmail.com>

Co-authored-by: Tzu-ping Chung <2e53b0ad3dd47d6e307c848b4062b6f9b074f9b0@gmail.com>
Co-authored-by: Xiaodong DENG <88c52341fa08274ad1da50d9b97f03e6c2a64b73@gmail.com>
Acehaidrey/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,apache/airflow,bolkedebruin/airflow,nathanielvarona/airflow,mistercrunch/airflow,dhuang/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,apache/incubator-airflow,dhuang/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,mistercrunch/airflow,apache/airflow,nathanielvarona/airflow,mistercrunch/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,dhuang/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,cfei18/incubator-airflow,bolkedebruin/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,dhuang/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,apache/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow