Merge pull request #52891 from hzxuzhonghu/cert-controller

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>.

remove duplicated code 

**What this PR does / why we need it**:
remove duplicated code

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

handler initiated twice.

```
	cc := &CertificateController{
		kubeClient: kubeClient,
		queue:      workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "certificate"),
		handler:    handler,
	}

      cc.handler = handler 
```
**Release note**:

```release-note
NONE
```

pkg/controller/certificates/certificate_controller.go

@@ -97,7 +97,6 @@ func NewCertificateController(
 	})
 	cc.csrLister = csrInformer.Lister()
 	cc.csrsSynced = csrInformer.Informer().HasSynced
-	cc.handler = handler
 	return cc
 }