Iterate over promises in reverse order

It is likely that the last promise completes last. If that is the case, we only wait once, the other promises are already completed and awaiting them has no overhead.

zio-kafka/src/main/scala/zio/kafka/producer/Producer.scala

@@ -486,8 +486,8 @@ private[producer] final class ProducerLive(
   ): ZIO[Any, Nothing, Chunk[Either[Throwable, RecordMetadata]]] =
     for {
       promises <- ZIO.foreach(serializedRecords)(sendRecord(runtime))
-      results  <- ZIO.foreach(promises)(_.await.either)
-    } yield results
+      results  <- ZIO.foreach(promises.reverse)(_.await.either)
+    } yield results.reverse
 
   private def sendRecord(
     runtime: Runtime[Any]