Execute refinery scripts in a k8s pod.
Provides an alternative runtime to exeute python scripts in a kubernetes pod via WMFKubernetesPodOperator.
Reactors drop_older_than logic from the util module to
operator/refinery.py, to make their behaviour
more explict and work around circular dependency issues
between util and kubernetes modules.
Bug: T383430
Bug: T384255
Related work: !1024 (merged)