Cut default backOff limit for parser in half

Issues with ParseJobs can rarely be fixed by retrying. No need to have
then started up too often

Author: J12934

operator/controllers/execution/scan_controller.go

@@ -323,6 +323,7 @@ func (r *ScanReconciler) startParser(scan *executionv1.Scan) error {
 			Labels:      labels,
 		},
 		Spec: batch.JobSpec{
+			BackoffLimit: 3,
 			Template: corev1.PodTemplateSpec{
 				Spec: corev1.PodSpec{
 					RestartPolicy:      corev1.RestartPolicyNever,