Backups Job show some permission errors in the log

### Summary

Backups Job show some permission errors in the log

### Current Behaviour 

Permission errors are showed in the logs

#### Steps to reproduce

1. Create a cluster with backup config in a namespace
2. Create a cluster with backup config in another namespace
3. Create a backup for the first cluster
4. Create a backup for the second cluster

### Expected Behaviour

Permission errors are not showed in the logs

### Environment

- StackGres version: 1.2.0
- Kubernetes version: ?
- Cloud provider or hardware configuration: ?

### Relevant logs and/or screenshots

```
Lock acquired
Error from server (Forbidden): sgbackups.stackgres.io is forbidden: User "system:serviceaccount:ndb-stage1:ndb-metadata-store-stage-backup" cannot list resource "sgbackups" in API group "stackgres.io" in the namespace "ndb-dev2"
Error from server (Forbidden): sgbackups.stackgres.io is forbidden: User "system:serviceaccount:ndb-stage1:ndb-metadata-store-stage-backup" cannot list resource "sgbackups" in API group "stackgres.io" in the namespace "ndb-dev3"
Creating backup CR
apiVersion: stackgres.io/v1
kind: SGBackup
metadata:
  annotations:
    scheduled-backup: "true"
    stackgres.io/operatorVersion: 1.2.0-SNAPSHOT
  creationTimestamp: "2022-05-18T00:00:08Z"
  generation: 1
  name: ndb-metadata-store-stage-2022-05-18-00-00-07
  namespace: ndb-stage1
  resourceVersion: "58474934"
  uid: 8588c36a-d51c-49fc-9479-40c93d36dfbc
spec:
  managedLifecycle: true
  sgCluster: ndb-metadata-store-stage
status:
  process:
    jobPod: ndb-metadata-store-stage-backup-27547200--1-f4ljp
    status: Running
  sgBackupConfig:
    baseBackups:
      compression: lz4
    storage:
      s3:
        awsCredentials:
          secretKeySelectors:
            accessKeyId:
              key: accessKeyId
              name: eks-backup-bucket-secret
            secretAccessKey:
              key: secretAccessKey
              name: eks-backup-bucket-secret
        bucket: era-stackgres-backup
      type: s3
Retrieving primary and replica
Primary is pod/ndb-metadata-store-stage-0
Replica not found, primary will be used for cleanups
Performing backup
Backup completed
Extracting pg_controldata
Extraction of pg_controldata completed
Retain backups
Check if backup base_000000010000000000000004 has to be retained and will retain 3 backups
Mark base_000000010000000000000004 as permanent and will retain 2 more backups
INFO: 2022/05/18 00:00:15.029810 Retrieving previous related backups to be marked: toPermanent=true
INFO: 2022/05/18 00:00:15.310107 Retrieved backups to be marked, marking: [base_000000010000000000000004]
Cleaning up impermanent backups
INFO: 2022/05/18 00:00:15.856539 retrieving permanent objects
INFO: 2022/05/18 00:00:16.027291 Found permanent objects: backups=map[base_000000010000000000000004:true], wals=map[000000010000000000000004:true]
INFO: 2022/05/18 00:00:16.186865 Start delete
INFO: 2022/05/18 00:00:16.369698 Objects in folder:
INFO: 2022/05/18 00:00:16.369744 	will be deleted: wal_005/000000010000000000000001.lz4
INFO: 2022/05/18 00:00:16.369752 	will be deleted: wal_005/000000010000000000000002.lz4
INFO: 2022/05/18 00:00:16.369759 	will be deleted: wal_005/000000010000000000000003.lz4
Check if backup base_000000010000000000000004 has to be set permanent or impermanent
Mark base_000000010000000000000004 as impermanent
INFO: 2022/05/18 00:00:17.458217 Retrieving previous related backups to be marked: toPermanent=false
INFO: 2022/05/18 00:00:17.602567 retrieving permanent objects
INFO: 2022/05/18 00:00:17.863245 Retrieved backups to be marked, marking: [base_000000010000000000000004]
Reconciliation of backups completed
Listing existing backups
Updating backup CR as completed
sgbackup.stackgres.io/ndb-metadata-store-stage-2022-05-18-00-00-07 patched
Backup CR updated as completed
Reconcile backup CRs
Reconciliation of backup CRs completed
Lock released
```

Story points: 8.0