Merge pull request #63582 from WanLinghao/sa_var_clean

Automatic merge from submit-queue. 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>.

clean unused variables on serviceaccounts_controller_test.go

**What this PR does / why we need it**:
this patch simply removes unused variables 
**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
```

pkg/controller/endpoint/endpoints_controller_test.go

@@ -110,11 +110,6 @@ func addNotReadyPodsWithSpecifiedRestartPolicyAndPhase(store cache.Store, namesp
 	}
 }
 
-type serverResponse struct {
-	statusCode int
-	obj        interface{}
-}
-
 func makeTestServer(t *testing.T, namespace string) (*httptest.Server, *utiltesting.FakeHandler) {
 	fakeEndpointsHandler := utiltesting.FakeHandler{
 		StatusCode:   http.StatusOK,

pkg/controller/serviceaccount/serviceaccounts_controller_test.go

@@ -29,11 +29,6 @@ import (
 	"k8s.io/kubernetes/pkg/controller"
 )
 
-type serverResponse struct {
-	statusCode int
-	obj        interface{}
-}
-
 func TestServiceAccountCreation(t *testing.T) {
 	ns := metav1.NamespaceDefault