Add cluster_labels and annotations to logical backup CronJob and Jobs (#3085)

* Add cluster_labels and annotations to logical backup CronJob and Jobs

When using the logical backup feature, the CronJob and its created Jobs
were missing the cluster_labels and annotations that are applied to
other cluster resources. This made it difficult to filter or identify
backup jobs using the same labels as other cluster components.

Changes:
- Added ObjectMeta with labels and annotations to JobTemplateSpec
- Updated CronJob ObjectMeta to use the merged labels (including
  'application: spilo-logical-backup')
- Updated tests to expect the new labels

pkg/cluster/k8sres.go

@@ -2414,6 +2414,10 @@ func (c *Cluster) generateLogicalBackupJob() (*batchv1.CronJob, error) {
 	// configure a cron job
 
 	jobTemplateSpec := batchv1.JobTemplateSpec{
+		ObjectMeta: metav1.ObjectMeta{
+			Labels:      labels,
+			Annotations: c.annotationsSet(annotations),
+		},
 		Spec: jobSpec,
 	}
 
@@ -2426,8 +2430,8 @@ func (c *Cluster) generateLogicalBackupJob() (*batchv1.CronJob, error) {
 		ObjectMeta: metav1.ObjectMeta{
 			Name:            c.getLogicalBackupJobName(),
 			Namespace:       c.Namespace,
-			Labels:          c.labelsSet(true),
-			Annotations:     c.annotationsSet(nil),
+			Labels:          labels,
+			Annotations:     c.annotationsSet(annotations),
 			OwnerReferences: c.ownerReferences(),
 		},
 		Spec: batchv1.CronJobSpec{