fix(core): Revert drain limit

Author: PerfectSlayer

dd-trace-core/src/main/java/datadog/trace/core/PendingTraceBuffer.java

@@ -245,7 +245,7 @@ public void run() {
 
             if (pendingTrace instanceof FlushElement) {
               // Since this is an MPSC queue, the drain needs to be called on the consumer thread
-              queue.drain(WriteDrain.WRITE_DRAIN, 50);
+              queue.drain(WriteDrain.WRITE_DRAIN);
               flushCounter.incrementAndGet();
               continue;
             }