make a proper -owide kubectl output

current state:

```
$ kubectl get objectstore -A
NAMESPACE NAME AGE
keycloak keycloak 20h
postgresql quizservicedb 29m
```

But if I would invoke the kubectl get -oyaml I see additional information in status field like:

```
status:
serverRecoveryWindow:
quizservicedb: {}
```

I would like to get additional columns in `kubectl get` command output which would give me more understanding about the status of objectstore - does it work, are the credentials correct etc. Maybe the last database backup timestamp.

Start by comparing the current `kubectl get objectstore -A` output with the fields shown by `kubectl get -oyaml`, especially the status information. Determine which status indicators and backup timestamp should become columns, then verify that the objectstore output exposes them clearly and consistently.

Vom Indexierungsmodell aus dem Issue-Text verfasst.