feat(minor): Add wait wait-for-jobs feature to only allow single backup job to be running

[stefanandres]

Add wait wait-for-jobs feature to only allow single backup job to be running

• ServiceAccount is deployed into each namespace (aka deployment of this helm chart)
• ClusterRole and ClusterRole is deployed for each deployment (because there is no easy way to re-use or only deploy this a single time in a cluster without workarounds)
• Adds initContainer that checks via kubectl get job -l <label> if there is already a running job and waits until there is none

[stefanandres]

Still a draft, actual testing is still outstanding