test_k8s/dumpsv1: batch multiple dump jobs in the same airflow task
This will allow us to reduce the overall DAG size, and to reduce the amount of pods we have to run in Kubernetes, which itself will reduce the amount of time we spend waiting for pods.
Signed-off-by: Balthazar Rouberol brouberol@wikimedia.org Bug: T392461
Closes T392461