Revert "Merge branch 'nnelson/update-storage_shard_creation-template-2020-10-05' into 'master'"

This reverts merge request !37 (merged)

After discussion with the team from this comment thread it was decided to undo the change to the procedural tasks to trigger the k8s-workloads/gitlab-com pipeline programmatically, and instead restore the method using a no-op MR+revert.