Add HyperShift specific priorityClass

HyperShift needs guest cluster control plane components with priority
"hypershift-control-plane", https://hypershift-docs.netlify.app/how-to/distribute-hosted-cluster-workloads/

pkg/operator/starter.go

@@ -56,6 +56,8 @@ const (
 	caBundleKey          = "ca-bundle.pem"
 
 	infrastructureName = "cluster"
+
+	hypershiftPriorityClass = "hypershift-control-plane"
 )
 
 func RunOperator(ctx context.Context, controllerConfig *controllercmd.ControllerContext, guestKubeConfigString string) error {
@@ -518,6 +520,8 @@ func withHypershiftDeploymentHook(isHypershift bool, hypershiftImage string) dc.
 			return nil
 		}
 
+		deployment.Spec.Template.Spec.PriorityClassName = hypershiftPriorityClass
+
 		// Inject into the pod the volumes used by CSI and token minter sidecars.
 		podSpec := &deployment.Spec.Template.Spec
 		podSpec.Volumes = append(podSpec.Volumes,