Merge pull request #33058 from MHBauer/dead-interface

Automatic merge from submit-queue

delete private interface with no references in package

<!--  Thanks for sending a pull request!  Here are some tips for you:
1. If this is your first time, read our contributor guidelines https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md and developer guide https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md
2. If you want *faster* PR reviews, read how: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/faster_reviews.md
3. Follow the instructions for writing a release note: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes
-->

**What this PR does / why we need it**:
code quality. 

**Which issue this PR fixes**:
does not fix anything. removes unused interface. 

**Special notes for your reviewer**:
It does not do anything. Let us remove it.

**Release note**:
<!--  Steps to write your release note:
1. Use the release-note-* labels to set the release note state (if you have access) 
2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`. 
-->
```release-note
NONE
```

pkg/kubectl/apply.go

@@ -25,10 +25,6 @@ import (
 	"k8s.io/kubernetes/pkg/runtime"
 )
 
-type debugError interface {
-	DebugError() (msg string, args []interface{})
-}
-
 // GetOriginalConfiguration retrieves the original configuration of the object
 // from the annotation, or nil if no annotation was found.
 func GetOriginalConfiguration(mapping *meta.RESTMapping, obj runtime.Object) ([]byte, error) {