Update release process for Providers (#24680)
Update release process for Providers (#24680)

This release process updates Provider's release approach and
"mixed-governance" model after the discussion and proposal

https://lists.apache.org/thread/6ngq79df7op541gfwntspdtsvzlv1cr6
danielvdende/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,danielvdende/incubator-airflow,apache/airflow,apache/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow