when client invoke cancel,it will trigger onCancel,not trigger onComplete (#7370)

Co-authored-by: Nsulie <sulie@gaoding.com>

apm-sniffer/apm-sdk-plugin/grpc-1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/grpc/v1/server/TracingServerCallListener.java

@@ -84,6 +84,7 @@ public class TracingServerCallListener<REQUEST> extends ForwardingServerCallList
             throw t;
         } finally {
             ContextManager.stopSpan();
+            asyncSpan.asyncFinish();
         }
     }