add the uid in a delete event to the absentOwnerCache

pkg/controller/garbagecollector/garbagecollector_test.go

@@ -300,6 +300,7 @@ func TestProcessEvent(t *testing.T) {
 			gc: &GarbageCollector{
 				dirtyQueue:       workqueue.NewTimedWorkQueue(),
 				clock:            clock.RealClock{},
+				absentOwnerCache: NewUIDCache(2),
 			},
 		}
 		for i := 0; i < len(scenario.events); i++ {