Remove old code when 1.3 branch is created

[Mateus Oliveira]

Remove this code

oadp-operator/controllers/nodeagent.go

Lines 74 to 81 in 22d063a

 // When updating from OADP version 1.1.x to 1.2.x, delete 
 // daemonset.apps/restic (it was renamed to daemonset.apps/node-agent) 
 // Needed if user upgraded to version < 1.2.2 
 if err := r.Delete(r.Context, &appsv1.DaemonSet{ObjectMeta: metav1.ObjectMeta{ 
 	Name: "restic", Namespace: r.NamespacedName.Namespace, 
 }}); err != nil && !errors.IsNotFound(err) { 
 	return false, err 
 } 

from master branch when oadp-1.3 branch is created