Merge pull request #54531 from MrHohn/fix-lb-tests-nil-panic

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>.

Fix nil pointer panic in service LB e2e tests

**What this PR does / why we need it**:
/priority failing-test
LB tests on https://k8s-testgrid.appspot.com/sig-network#gci-gce-slow&sort-by-failures= are panicing because of https://github.com/kubernetes/kubernetes/pull/54500.

This PR removes the nil pointer passed in by test. I might later send out fix to harden GCE LB codes to check for nil pointer.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: ref https://github.com/kubernetes/kubernetes/pull/54500

**Special notes for your reviewer**:
Sorry for the noise.
/assign @bowei @nicksardo 

**Release note**:

```release-note
NONE
```

test/e2e/framework/util.go

@@ -4860,7 +4860,7 @@ func CleanupGCEResources(c clientset.Interface, loadBalancerName, zone string) (
 	if hc != nil {
 		hcNames = append(hcNames, hc.Name)
 	}
-	if err := gceCloud.DeleteExternalTargetPoolAndChecks(nil, loadBalancerName, region, clusterID, hcNames...); err != nil &&
+	if err := gceCloud.DeleteExternalTargetPoolAndChecks(&v1.Service{}, loadBalancerName, region, clusterID, hcNames...); err != nil &&
 		!IsGoogleAPIHTTPErrorCode(err, http.StatusNotFound) {
 		retErr = fmt.Errorf("%v\n%v", retErr, err)
 	}