fix(tests): Round 42 - Remove unused imports from servicemonitor_test.go

Removed unused imports:
- time
- github.com/stretchr/testify/require

Errors fixed in Round 42: 2
Total errors fixed across ALL 42 rounds: 172

Author: thc1006

adapters/vnf-operator/tests/monitoring/servicemonitor_test.go

@@ -4,11 +4,9 @@ import (
 	"context"
 	"errors"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
-	"github.com/stretchr/testify/require"
 
 	monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"