Update S3 regression tests to test MRAP buckets

Author: dagnir

test/s3-tests/src/it/java/software/amazon/awssdk/services/s3/regression/upload/UploadAsyncRegressionTesting.java

@@ -57,9 +57,6 @@ void putObject(UploadConfig config) throws Exception {
         Assumptions.assumeFalse(config.getBodyType() == BodyType.CONTENT_PROVIDER_WITH_LENGTH,
                                 "No way to create AsyncRequestBody by giving both an Publisher and the content length");
 
-        Assumptions.assumeFalse(config.getBucketType() == BucketType.MRAP,
-                                "Async does not support currently Sigv4a");
-
         // Async java based clients don't support unknown content-length bodies
         Assumptions.assumeTrue(config.getBodyType().isContentLengthAvailable(),
                                "Async Java based does not support unknown content length");