Adds predicates to filter Nova reconciliation triggers

When a RabbitMQ notification pod restarts, the operator controller is
reconciling lot of times (~40+) due to status-only updates from owned
resources without any actual change in Nova CR spec

The issues occured because Nova is watching all resources without
predicates. this change adds inbuilt GenerationChangedPredicate to
child CRs (Nova services only) to only reconcile on spec changes,
not status-only updates.

Related: #OSPRH-26922

Author: auniyal61

internal/controller/nova_controller.go

@@ -2341,12 +2341,18 @@ func (r *NovaReconciler) SetupWithManager(mgr ctrl.Manager) error {
 		Owns(&mariadbv1.MariaDBDatabase{}).
 		Owns(&mariadbv1.MariaDBAccount{}).
 		Owns(&keystonev1.KeystoneService{}).
-		Owns(&novav1.NovaAPI{}).
-		Owns(&novav1.NovaScheduler{}).
-		Owns(&novav1.NovaCell{}).
-		Owns(&novav1.NovaMetadata{}).
+		Owns(&novav1.NovaAPI{},
+			builder.WithPredicates(predicate.GenerationChangedPredicate{})).
+		Owns(&novav1.NovaScheduler{},
+			builder.WithPredicates(predicate.GenerationChangedPredicate{})).
+		Owns(&novav1.NovaCell{},
+			builder.WithPredicates(predicate.GenerationChangedPredicate{})).
+		Owns(&novav1.NovaConductor{},
+			builder.WithPredicates(predicate.GenerationChangedPredicate{})).
+		Owns(&novav1.NovaMetadata{},
+			builder.WithPredicates(predicate.GenerationChangedPredicate{})).
 		Owns(&rabbitmqv1.TransportURL{},
-			builder.WithPredicates(predicate.ResourceVersionChangedPredicate{})).
+			builder.WithPredicates(predicate.GenerationChangedPredicate{})).
 		Owns(&batchv1.Job{}).
 		Owns(&corev1.ServiceAccount{}).
 		Owns(&rbacv1.Role{}).