fix consumer close may block forever (#25120)

Signed-off-by: NWei Liu <wei.liu@zilliz.com>

pkg/mq/msgstream/mqwrapper/kafka/kafka_consumer.go

@@ -149,7 +149,11 @@ func (kc *Consumer) Chan() <-chan mqwrapper.Message {
 							kc.skipMsg = false
 							continue
 						}
-						kc.msgChannel <- &kafkaMessage{msg: e}
+
+						select {
+						case kc.msgChannel <- &kafkaMessage{msg: e}:
+						case <-kc.closeCh:
+						}
 					}
 				}
 			}

pkg/mq/msgstream/mqwrapper/pulsar/pulsar_consumer.go

@@ -76,8 +76,12 @@ func (pc *Consumer) Chan() <-chan mqwrapper.Message {
 							log.Debug("pulsar consumer channel closed")
 							return
 						}
+
 						if !pc.skip {
-							pc.msgChannel <- &pulsarMessage{msg: msg}
+							select {
+							case pc.msgChannel <- &pulsarMessage{msg: msg}:
+							case <-pc.closeCh:
+							}
 						} else {
 							pc.skip = false
 						}