[I] [Improvement] Optimize the error message when unable to load the catalog while using Flink. [gravitino]

[via GitHub]

hdygxsj opened a new issue, #6771:
URL: https://github.com/apache/gravitino/issues/6771

   ### What would you like to be improved?
   
   The catalog cannot be created normally, but an exception indicating that the 
catalog does not exist is thrown, which is difficult to understand.
   <img width="891" alt="Image" 
src="https://github.com/user-attachments/assets/74bc578e-82f5-4f18-9011-7365af62a7b9";
 />
   
   
![Image](https://github.com/user-attachments/assets/77871167-9904-485f-9a2f-35f4cb1dca05)
   
   
   ### How should we improve?
   
   just optimize the error message;


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