enhance: Add `WithBlock` option for etcd client creation (#32641)

Related to #32598

Use `WithBlock` may fail fast when create etcd client to some invalid
etcd endpoints and make it easier to check problem.

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

pkg/util/etcd/etcd_util.go

@@ -28,6 +28,7 @@ import (
 	clientv3 "go.etcd.io/etcd/client/v3"
 	"go.etcd.io/etcd/server/v3/embed"
 	"go.uber.org/zap"
+	"google.golang.org/grpc"
 
 	"github.com/milvus-io/milvus/pkg/log"
 )
@@ -64,6 +65,9 @@ func GetRemoteEtcdClient(endpoints []string) (*clientv3.Client, error) {
 	return clientv3.New(clientv3.Config{
 		Endpoints:   endpoints,
 		DialTimeout: 5 * time.Second,
+		DialOptions: []grpc.DialOption{
+			grpc.WithBlock(),
+		},
 	})
 }
 
@@ -73,6 +77,9 @@ func GetRemoteEtcdClientWithAuth(endpoints []string, userName, password string)
 		DialTimeout: 5 * time.Second,
 		Username:    userName,
 		Password:    password,
+		DialOptions: []grpc.DialOption{
+			grpc.WithBlock(),
+		},
 	})
 }
 
@@ -119,6 +126,8 @@ func GetRemoteEtcdSSLClientWithCfg(endpoints []string, certFile string, keyFile
 		return nil, errors.Errorf("unknown TLS version,%s", minVersion)
 	}
 
+	cfg.DialOptions = append(cfg.DialOptions, grpc.WithBlock())
+
 	return clientv3.New(cfg)
 }