Merge pull request #52971 from dixudx/kubectl_not_parsing_labelSelector

Automatic merge from submit-queue (batch tested with PRs 51771, 52971). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

pass labelSelector to server side opaquely

**What this PR does / why we need it**:
From @smarterclayton 
> The server is responsible for handling label selection for the most part. There is some level of client side processing possible, but for the most part `label selector` should be able to be passed opaquely.

xref #50140

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:
/assign @smarterclayton @liggitt 

**Release note**:

```release-note
None
```

test/e2e/kubectl/kubectl.go

@@ -554,7 +554,7 @@ var _ = SIGDescribe("Kubectl client", func() {
 				ExecOrDie()
 			Expect(runOutput).ToNot(ContainSubstring("stdin closed"))
 			g := func(pods []*v1.Pod) sort.Interface { return sort.Reverse(controller.ActivePods(pods)) }
-			runTestPod, _, err := util.GetFirstPod(f.InternalClientset.Core(), ns, labels.SelectorFromSet(map[string]string{"run": "run-test-3"}), 1*time.Minute, g)
+			runTestPod, _, err := util.GetFirstPod(f.InternalClientset.Core(), ns, "run=run-test-3", 1*time.Minute, g)
 			if err != nil {
 				os.Exit(1)
 			}