Add docker image run tag in k8s launchers
The k8s launchers have been slacking compared to their more informative Docker launcher cousin.
Potential oddity in the future if we ever support multi-container pipelines. But cross that bridge then?
note- will break internal docker integration test, due to tag rename
Reviewers: rexledesma, dgibson
Reviewed By: dgibson
Differential Revision: https://dagster.phacility.com/D7292