[PR] Fix @master_heartbeat_period to 15 seconds [shardingsphere]

[via GitHub]

RaigorJiang opened a new pull request, #34873:
URL: https://github.com/apache/shardingsphere/pull/34873

   ### Before
   - SET @master_heartbeat_period=15000000
   
![image](https://github.com/user-attachments/assets/db19a2d9-0ab0-42c0-99fa-b6805d524d0b)
   
   - Heartbeat interval is about 1.5 milliseconds
   
![image](https://github.com/user-attachments/assets/0cfe782d-c5a8-4a11-a047-85a2b37fd639)
   
   ### After
   - SET @master_heartbeat_period=15000000000
   
![image](https://github.com/user-attachments/assets/977650ab-2d99-4620-ba36-df2641c836ad)
   
   - Heartbeat interval is about 15 seconds
   
![image](https://github.com/user-attachments/assets/9037cb5c-b469-488f-a7f1-a8f84cd61a33)
   


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