EndpointSliceTracker should track updated resource version

During EndpointSlice reconcilation, EndpointSliceTracker is supposed to
track expected EndpointSlice resource versions so that external changes
to them can be detected. But it actually tracked the stale resource
version and resulted in every Service was handled twice as it always
received an EndpointSlice update with a different resource version but
was actually created/updated by itself during the first processing.

pkg/controller/endpointslice/utils_test.go

@@ -401,9 +401,15 @@ func newClientset() *fake.Clientset {
 			endpointSlice.ObjectMeta.Name = fmt.Sprintf("%s-%s", endpointSlice.ObjectMeta.GenerateName, rand.String(8))
 			endpointSlice.ObjectMeta.GenerateName = ""
 		}
+		endpointSlice.ObjectMeta.ResourceVersion = "100"
 
 		return false, endpointSlice, nil
 	}))
+	client.PrependReactor("update", "endpointslices", k8stesting.ReactionFunc(func(action k8stesting.Action) (bool, runtime.Object, error) {
+		endpointSlice := action.(k8stesting.CreateAction).GetObject().(*discovery.EndpointSlice)
+		endpointSlice.ObjectMeta.ResourceVersion = "200"
+		return false, endpointSlice, nil
+	}))
 
 	return client
 }