Call checkDynamicConfig() at DSM start to load tracer config, then ag…

…ain at Inbox start to merge agent config

dd-trace-core/src/main/java/datadog/trace/core/datastreams/DefaultDataStreamsMonitoring.java

@@ -136,6 +136,7 @@ public DefaultDataStreamsMonitoring(
 
   @Override
   public void start() {
+    checkDynamicConfig();
     cancellation =
         AgentTaskScheduler.INSTANCE.scheduleAtFixedRate(
             new ReportTask(), this, bucketDurationNanos, bucketDurationNanos, TimeUnit.NANOSECONDS);