Propagate ClusterDomain from server to reconciler (#707)

Signed-off-by: Yuki Iwai <yuki.iwai.tz@gmail.com>

pkg/controller/mpi_job_controller.go

@@ -350,6 +350,7 @@ func NewMPIJobControllerWithClock(
 			workqueue.TypedRateLimitingQueueConfig[any]{Name: "MPIJob"},
 		),
 		recorder:      recorder,
+		clusterDomain: opt.ClusterDomain,
 		clock:         clock,
 	}