MedusaTask deletes medusaBackups of another clusters in the same namespace

[18ab21]

What happened?
MedusaTask with operation sync deletes medusabackups of another cassandradatacenters in namespace.

Did you expect to see something different?
I expect, that MedusaTask deletes only medusabackups of its own cassandraDatacenter

How to reproduce it (as minimally and precisely as possible):

1. Create two k8ssandraclusters in one namespace
2. Create N (N > maxBackupCount ) medusabackupjobs for each cassandradatecenter
3. See kubectl -n yournamespace get medusabackups
4. Create medusapurgetask for one datacenter
5. See kubectl -n yournamespace get medusabackups
6. See logs of k8ssandra-operator

Environment

• K8ssandra Operator version:

k8ssandra-operator:v1.6.0

• Kubernetes version information:

GitVersion:"v1.23.14"

• Kubernetes cluster kind:

• K8ssandra Operator Logs:

2023-07-10T12:39:59.942Z        INFO    Syncing Backup  {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as
-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest3-dcb-1688992535"}
2023-07-10T12:39:59.942Z        INFO    Syncing Backup  {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest3-dca-1688992692"}
2023-07-10T12:39:59.942Z        INFO    Syncing Backup  {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest3-dcb-1688992692"}
2023-07-10T12:39:59.942Z        INFO    Deleting Cassandra Backup       {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest2-d-dcb"}
2023-07-10T12:39:59.970Z        INFO    Deleted Cassandra Backup        {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest2-d-dcb"}
2023-07-10T12:39:59.970Z        INFO    Deleting Cassandra Backup       {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest2-dca-1688992534"}
2023-07-10T12:39:59.998Z        INFO    Deleted Cassandra Backup        {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest2-dca-1688992534"}
2023-07-10T12:39:59.998Z        INFO    Deleting Cassandra Backup       {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest2-dcb-1688992691"}
2023-07-10T12:40:00.163Z        INFO    Deleted Cassandra Backup        {"controller": "medusatask", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaTask", "MedusaTask": {"name":"purge-backyo-agtest3-dca-sync","namespace":"cassandra-as-service"}, "namespace": "cassandra-as-service", "name": "purge-backyo-agtest3-dca-sync", "reconcileID": "bafdc80b-c472-4161-9411-53bb7f186b0c", "MedusaTask": "cassandra-as-service/purge-backyo-agtest3-dca-sync", "cassdc": "agtest3-dca", "Backup": "backup-agtest2-dcb-1688992691"}

Anything else we need to know?:

I think in this https://github.com/k8ssandra/k8ssandra-operator/blob/main/controllers/medusa/medusatask_controller.go#L297 place we should to add condition "&& backup.Spec.CassandraDatacenter == task.Spec.CassandraDatacenter"