* Ensure infra_image gets proper label used for reconciliation
Currently infra containers are not cleaned up as part of the dangling container
cleanup routine. The reason is that Nomad checks if a container is a Nomad owned
container by verifying the existence of the: `com.hashicorp.nomad.alloc_id` label.
Ensure we set this label on the infra container as well.
* fix unit test
* changelog: add entry
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Co-authored-by: Seth Hoenig <shoenig@duck.com>
