test:Fix two potential goroutine leaks (#8964)

Signed-off-by: lzhfromustc <lzhfromustc@gmail.com>

discovery/manager_test.go

@@ -1371,7 +1371,11 @@ func (tp mockdiscoveryProvider) Run(ctx context.Context, upCh chan<- []*targetgr
 		for i := range u.targetGroups {
 			tgs[i] = &u.targetGroups[i]
 		}
-		upCh <- tgs
+		select {
+		case <-ctx.Done():
+			return
+		case upCh <- tgs:
+		}
 	}
 	<-ctx.Done()
 }

storage/remote/queue_manager_test.go

@@ -408,6 +408,7 @@ func TestReleaseNoninternedString(t *testing.T) {
 	c := NewTestWriteClient()
 	m := NewQueueManager(metrics, nil, nil, nil, "", newEWMARate(ewmaWeight, shardUpdateDuration), cfg, mcfg, nil, nil, c, defaultFlushDeadline, newPool(), newHighestTimestampMetric(), nil, false)
 	m.Start()
+	defer m.Stop()
 
 	for i := 1; i < 1000; i++ {
 		m.StoreSeries([]record.RefSeries{