chore: controller-gen task should respect kubebuilder:rbac markers

[NiccoloFei]

Closes #413

[NiccoloFei]

Steps to test the task.

rm api/v1/zz_generated.deepcopy.go
rm config/rbac/role.yaml
rm config/crd/bases/barmancloud.cnpg.io_objectstores.yaml

task controller-gen

All the files should be properly recreated.

Edit or add a new RBAC directive, e.g.

--- a/internal/controller/objectstore_controller.go
+++ b/internal/controller/objectstore_controller.go
@@ -41,6 +41,7 @@ type ObjectStoreReconciler struct {
 // +kubebuilder:rbac:groups=barmancloud.cnpg.io,resources=objectstores,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=barmancloud.cnpg.io,resources=objectstores/status,verbs=get;update;patch
 // +kubebuilder:rbac:groups=barmancloud.cnpg.io,resources=objectstores/finalizers,verbs=update
+// +kubebuilder:rbac:groups="",resources=service,verbs=create;list;get;watch;delete

Running task controller-gen should update config/rbac/role.yaml accordingly.