Description of the problem: the backup/restore labels are not added on specific resources. As the user story - https://github.com/stolostron/backlog/issues/18324 list, these secret/configmap should be added backup/restore labels, but not, like observability-server-ca-certs, alertmanager-config, etc.

Release version: 2.5

Operator snapshot version:

OCP version: 4.10

Browser Info:

Steps to reproduce:
1. Deploy ACM and Observability
2. 
create one custom rule for alert ClusterCPUHealth-jb and forward to slack channel

create one cm observability-metrics-custom-allowlist for collecting node_memory_Active_bytes and stop collecting cluster:capacity_cpu_cores:sum

create one cm sample-dashboard for custom dashboard

create one grafana-dev instance
3. Check secret and configmap labels for backup/restore
4. only these resources have backup/restore labels
```
# oc get secret -n open-cluster-management-observability -l cluster.open-cluster-management.io/backup
NAME                          TYPE     DATA   AGE
observability-grafana-certs   Opaque   3      16h
observability-server-certs    Opaque   3      16h

# oc get configmap -n open-cluster-management-observability -l cluster.open-cluster-management.io/backup
NAME                                     DATA   AGE
clustercpu                               1      69m
observability-metrics-custom-allowlist   1      111m
sample-dashboard                         1      100m
thanos-ruler-custom-rules                1      88m
```

Actual results:

Expected results:

Additional info: