Allowlist controller: remove unused scheme field

The runtime.Scheme field was never used - controller creates objects
directly via client.Create() without needing type conversion or owner
references.

Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Konstantinos Karampogias <karampok@gmail.com>

Author: karampok

pkg/controller/allowlist/allowlist_controller.go

@@ -20,7 +20,6 @@ import (
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
-	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
@@ -80,7 +79,6 @@ var _ reconcile.Reconciler = &ReconcileAllowlist{}
 
 type ReconcileAllowlist struct {
 	client cnoclient.Client
-	scheme *runtime.Scheme
 	status *statusmanager.StatusManager
 }