Merge pull request #63067 from k82cn/k8s_63027

Automatic merge from submit-queue (batch tested with PRs 62982, 63075, 63067, 62877, 63141). 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>.

Removed e2e test on empty NodeAffinity.

Signed-off-by: Da K. Ma <klaus1982.cn@gmail.com>

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #63027 

**Special notes for your reviewer**:
In #62448, we removed the validation on empty `nodeAffinity` which is already handled in scheduler: select no objects.

**Release note**:
```release-note
None
```

pkg/apis/core/validation/validation_test.go

@@ -6582,6 +6582,31 @@ func TestValidatePod(t *testing.T) {
 				}),
 			},
 		},
+		"invalid node selector requirement in node affinity, key is invalid": {
+			expectedError: "spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution.nodeSelectorTerms[0].matchExpressions[0].key",
+			spec: core.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "123",
+					Namespace: "ns",
+				},
+				Spec: validPodSpec(&core.Affinity{
+					NodeAffinity: &core.NodeAffinity{
+						RequiredDuringSchedulingIgnoredDuringExecution: &core.NodeSelector{
+							NodeSelectorTerms: []core.NodeSelectorTerm{
+								{
+									MatchExpressions: []core.NodeSelectorRequirement{
+										{
+											Key:      "invalid key ___@#",
+											Operator: core.NodeSelectorOpExists,
+										},
+									},
+								},
+							},
+						},
+					},
+				}),
+			},
+		},
 		"invalid node field selector requirement in node affinity, more values for field selector": {
 			expectedError: "spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution.nodeSelectorTerms[0].matchFields[0].values",
 			spec: core.Pod{