Fix TraceSegmentServiceClient flush to restart report loop after manual flush

Author: songzhendong

src/agent/core/remote/TraceSegmentServiceClient.ts

@@ -172,6 +172,11 @@ export default class TraceSegmentServiceClient implements BootService, GRPCChann
 this.timeout=undefined;
 }
 
-returnthis.buffer.length===0 ? null : this.reportOnce();
+if(this.buffer.length===0){
+this.scheduleNextReport();
+returnnull;
+}
+
+returnthis.reportOnce().finally(()=>this.scheduleNextReport());
 }
 }