Merge pull request #46091 from xilabao/new-output-in-edit

Automatic merge from submit-queue (batch tested with PRs 46091, 48280)

allow output patch string in edit command

**What this PR does / why we need it**:
allow user to get the patch from edit command if user is not familiar with the patch format.

```
# ./cluster/kubectl.sh create role a --verb=get,list --resource=no
role "a" created

# ./cluster/kubectl.sh edit role a --output-patch=true
Patch: {"rules":[{"apiGroups":[""],"resources":["nodes"],"verbs":["get","list","delete"]}]}
role "a" edited

# ./cluster/kubectl.sh create role b --verb=get,list --resource=no
role "b" created

# ./cluster/kubectl.sh patch role b -p '{"rules":[{"apiGroups":[""],"resources":["nodes"],"verbs":["get","list","delete"]}]}'
role "b" patched
```
**Which issue this PR fixes**: fixes #47173

**Special notes for your reviewer**:

**Release note**:

```release-note
Could get the patch from kubectl edit command
```

pkg/kubectl/cmd/util/editor/editoptions.go

@@ -53,6 +53,7 @@ type EditOptions struct {
 	resource.FilenameOptions
 
 	Output             string
+	OutputPatch        bool
 	WindowsLineEndings bool
 
 	cmdutil.ValidateOptions
@@ -96,6 +97,10 @@ func (o *EditOptions) Complete(f cmdutil.Factory, out, errOut io.Writer, args []
 	}
 	o.editPrinterOptions = getPrinter(o.Output)
 
+	if o.OutputPatch && o.EditMode != NormalEditMode {
+		return fmt.Errorf("the edit mode doesn't support output the patch")
+	}
+
 	cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
 	if err != nil {
 		return err
@@ -577,6 +582,10 @@ func (o *EditOptions) visitToPatch(
 			}
 		}
 
+		if o.OutputPatch {
+			fmt.Fprintf(o.Out, "Patch: %s\n", string(patch))
+		}
+
 		patched, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, patchType, patch)
 		if err != nil {
 			fmt.Fprintln(o.ErrOut, results.addError(err, info))