[VIRT] Add client parameter to descheduler resources (#5185)

##### What this PR does / why we need it:
Add client parameter to descheduler resources


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## Summary by CodeRabbit

* **Tests**
* Enhanced test infrastructure for descheduler operator reconciliation
testing to improve client parameter handling and isolation.

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Signed-off-by: Denys Shchedrivyi <dshchedr@redhat.com>

Author: dshchedr

tests/virt/node/descheduler/conftest.py

@@ -37,7 +37,7 @@
 
 
 @pytest.fixture(scope="package")
-def descheduler_operator_reconciled():
+def descheduler_operator_reconciled(admin_client):
     """Restart descheduler-operator deployment to trigger reconciliation.
 
     Workaround for the issue when descheduler is installed before other OpenShift operators.
@@ -48,6 +48,7 @@ def descheduler_operator_reconciled():
     deployment = Deployment(
         name="descheduler-operator",
         namespace=NamespacesNames.OPENSHIFT_KUBE_DESCHEDULER_OPERATOR,
+        client=admin_client,
     )
     initial_replicas = deployment.instance.spec.replicas
     deployment.scale_replicas(replica_count=0)
@@ -258,6 +259,7 @@ def utilization_imbalance(
     with PodDisruptionBudget(
         name=utilization_imbalance_deployment_name,
         namespace=namespace.name,
+        client=admin_client,
         min_available=unallocated_pod_count,
         selector=evict_protected_pod_selector,
     ):