fix(storage): remove duplicate error callback (#1366)

Author: Jordan-Nelson

aws-storage-s3/src/main/java/com/amplifyframework/storage/s3/operation/AWSS3StorageDownloadFileOperation.java

@@ -173,11 +173,7 @@ public void onStateChanged(int transferId, TransferState state) {
                     onSuccess.accept(StorageDownloadFileResult.fromFile(file));
                     return;
                 case FAILED:
-                    onError.accept(new StorageException(
-                            "Storage download operation was interrupted.",
-                            "Please verify that you have a stable internet connection."
-                    ));
-                    return;
+                    // no-op;
                 default:
                     // no-op;
             }

aws-storage-s3/src/main/java/com/amplifyframework/storage/s3/operation/AWSS3StorageUploadFileOperation.java

@@ -185,11 +185,7 @@ public void onStateChanged(int transferId, TransferState state) {
                     onSuccess.accept(StorageUploadFileResult.fromKey(getRequest().getKey()));
                     return;
                 case FAILED:
-                    onError.accept(new StorageException(
-                            "Storage upload operation was interrupted.",
-                            "Please verify that you have a stable internet connection."
-                    ));
-                    return;
+                    // no-op;
                 default:
                     // no-op;
             }

testutils/src/main/java/com/amplifyframework/testutils/Await.java

@@ -146,6 +146,9 @@ private static <R, E extends Throwable> void await(
                         resultContainer.set(result);
                         latch.countDown();
                     }, error -> {
+                        if (errorContainer.get() != null) {
+                            throw new RuntimeException("Error callback called more than once with error: " + error);
+                        }
                         errorContainer.set(error);
                         latch.countDown();
                     }