Fix the potential race condition of InitializeSubnetService

It is possible that an error occurs when trying to send to the already closed `fatalErrors` channel, resulting in a panic.

.gitignore

@@ -2,4 +2,5 @@
 bin/
 .DS_Store
 go.work
-go.work.sum
+go.work.sum
+.tool-versions

pkg/nsx/services/subnet/subnet.go

@@ -65,20 +65,36 @@ func InitializeSubnetService(service common.Service) (*SubnetService, error) {
 		},
 	}
 
+	// Use sync.Once to ensure channel is closed only once
+	var closeOnce sync.Once
+
 	wg.Add(1)
 	go subnetService.InitializeResourceStore(&wg, fatalErrors, ResourceTypeSubnet, nil, subnetService.SubnetStore)
 	go func() {
 		wg.Wait()
-		close(wgDone)
+		closeOnce.Do(func() {
+			close(wgDone)
+		})
 	}()
 	select {
 	case <-wgDone:
-		break
+		closeOnce.Do(func() {
+			close(fatalErrors)
+		})
+		return subnetService, nil
 	case err := <-fatalErrors:
-		close(fatalErrors)
+		// Wait for any pending operations to complete
+		go func() {
+			wg.Wait() // Ensure all goroutines complete
+			closeOnce.Do(func() {
+				close(wgDone)
+			})
+		}()
+		closeOnce.Do(func() {
+			close(fatalErrors)
+		})
 		return subnetService, err
 	}
-	return subnetService, nil
 }
 
 func (service *SubnetService) CreateOrUpdateSubnet(obj client.Object, vpcInfo common.VPCResourceInfo, tags []model.Tag) (string, error) {