Merge pull request #58283 from nikhita/kubectl-scale-unstructured

Automatic merge from submit-queue (batch tested with PRs 59463, 59719, 60181, 58283, 59966). 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>.

kubectl scale: support Unstructured objects

Support `Unstructured` objects with kubectl scale.

So that we can use the scale subresource for custom resources (possible after https://github.com/kubernetes/kubernetes/pull/55168 is merged):

```
➜ cluster/kubectl.sh scale --replicas=5 crontabs/my-new-cron-object
crontab "my-new-cron-object" scaled
```

**Release note**:

```release-note
NONE
```

/cc sttts deads2k p0lyn0mial

pkg/kubectl/cmd/scale.go

@@ -110,7 +110,7 @@ func RunScale(f cmdutil.Factory, out, errOut io.Writer, cmd *cobra.Command, args
 	all := cmdutil.GetFlagBool(cmd, "all")
 
 	r := f.NewBuilder().
-		Internal().
+		Unstructured().
 		ContinueOnError().
 		NamespaceParam(cmdNamespace).DefaultNamespace().
 		FilenameParam(enforceNamespace, options).
@@ -173,7 +173,7 @@ func RunScale(f cmdutil.Factory, out, errOut io.Writer, cmd *cobra.Command, args
 				return err
 			}
 			mapping := info.ResourceMapping()
-			client, err := f.ClientForMapping(mapping)
+			client, err := f.UnstructuredClientForMapping(mapping)
 			if err != nil {
 				return err
 			}