Fix Go vet errors for master golang

Co-authored-by: Rajalakshmi-Girish <rajalakshmi.girish1@ibm.com>
Co-authored-by: Abhishek Kr Srivastav <Abhishek.kr.srivastav@ibm.com>

Kubernetes-commit: 9d10ddb0608aa20ce287c89be879f888f5823cf9

pkg/apiserver/validation/validation_test.go

@@ -620,7 +620,7 @@ func TestValidateCustomResource(t *testing.T) {
 				}
 				errs, _ := celValidator.Validate(context.TODO(), nil, structural, obj, oldObject, celconfig.RuntimeCELCostBudget)
 				if len(errs) > 0 {
-					t.Errorf(errs.ToAggregate().Error())
+					t.Error(errs.ToAggregate().Error())
 				}
 			}
 			for i, failingObject := range tt.failingObjects {