Handle a MySqlException with error code XAERRemoveFail indicating the XA state is ROLLBACK ONLY.

Author: PatrickMNL

src/MySqlConnector/Core/XaEnlistedTransaction.cs

@@ -32,8 +32,15 @@ protected override void OnRollback(Enlistment enlistment)
 	{
 		try
 		{
-			if (!IsPrepared)
-				ExecuteXaCommand("END");
+			try
+			{
+				if (!IsPrepared)
+					ExecuteXaCommand("END");
+			}
+			catch (MySqlException ex) when (ex.ErrorCode is MySqlErrorCode.XAERRemoveFail && ex.Message.Contains("ROLLBACK ONLY"))
+			{
+				// ignore unprepared end failure when XAERRemoveFail is returned telling us the XA state is ROLLBACK ONLY.
+			}
 
 			ExecuteXaCommand("ROLLBACK");
 		}