Fix SqsAsyncBatchManager excessive batch flushing under heavy load (#6374)#6378

joviegas merged 2 commits intoaws:masteraws/aws-sdk-java-v2:masterfrom

thornhillcody:thornhillcody/fix-sqs-async-batchman-flushthornhillcody/aws-sdk-java-v2:thornhillcody/fix-sqs-async-batchman-flushCopy head branch name to clipboard