Merge pull request #66559 from yue9944882/chore/clean-up-legacyreststorage-test

Automatic merge from submit-queue (batch tested with PRs 67085, 66559, 67089). 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>.

cleaning up unused LegacyRestStorage for apiserver test

**What this PR does / why we need it**:

As the title

**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 #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/apiserver/pkg/endpoints/apiserver_test.go

@@ -567,15 +567,6 @@ func (s *ConnecterRESTStorage) NewConnectOptions() (runtime.Object, bool, string
 	return s.emptyConnectOptions, false, ""
 }
 
-type LegacyRESTStorage struct {
-	*SimpleRESTStorage
-}
-
-func (storage LegacyRESTStorage) Delete(ctx context.Context, id string) (runtime.Object, error) {
-	obj, _, err := storage.SimpleRESTStorage.Delete(ctx, id, nil)
-	return obj, err
-}
-
 type MetadataRESTStorage struct {
 	*SimpleRESTStorage
 	types []string