Merge pull request #51761 from karataliu/ccmupdatenode

Automatic merge from submit-queue (batch tested with PRs 51819, 51706, 51761, 51818, 51500)

Fix providerID update validation

**What this PR does / why we need it**:
Cloud controller manager supports updating providerID in #50730, but the node updating was blocked by 
validation rule.

This is to propose a fix for updating the validation rule by allowing altering spec.providerID if not set.

Please check #51596 for detail

**Which issue this PR fixes**
fixes #51596

**Special notes for your reviewer**:

**Release note**:
```release-note
```

pkg/api/validation/validation_test.go

@@ -8375,6 +8375,33 @@ func TestValidateNodeUpdate(t *testing.T) {
 				},
 			},
 		}, false},
+		{api.Node{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "update-provider-id-when-not-set",
+			},
+		}, api.Node{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "update-provider-id-when-not-set",
+			},
+			Spec: api.NodeSpec{
+				ProviderID: "provider:///new",
+			},
+		}, true},
+		{api.Node{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "update-provider-id-when-set",
+			},
+			Spec: api.NodeSpec{
+				ProviderID: "provider:///old",
+			},
+		}, api.Node{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "update-provider-id-when-set",
+			},
+			Spec: api.NodeSpec{
+				ProviderID: "provider:///new",
+			},
+		}, false},
 	}
 	for i, test := range tests {
 		test.oldNode.ObjectMeta.ResourceVersion = "1"