* Revert changes made to refine_webrequest_frontend_hourly_dag_factory

* Also, add `isort --version` printout

* "Fixing" the isort issue (again)

* Fix isort issue with refine_webrequest_frontend_hourly_dag_factory.py

* Formatting fixes to appease python black formatter

* Implementation of k8s_proof_url function

* Add a utility function to wmf_airflow_common.util package that
converts a given URL to its correct envoy:port combination if the
function is running inside a Kubernetes deployment
* Add test case coverage