[PR] Enhance query visualization by preventing duplicate node additions and improving edge connections in flowchart generation [pinot]

[via GitHub]

gortiz opened a new pull request, #15025:
URL: https://github.com/apache/pinot/pull/15025

   Recently, in https://github.com/apache/pinot/pull/14848, we introduced a new 
way to visualize multi stage stats.
   
   This PR improves that visualization when spools are used. When spools are 
used, the execution flows is not a tree anymore but a direct acyclic graph (aka 
DAG). Although in this case we still duplicate stats in the json response, with 
this PR the visualization is presented as an actual DAG.
   
   With the new implementation the stats of the query
   ```sql
   SET useSpools=true; 
   SELECT * 
   FROM userAttributes as a1 
   JOIN userGroups as b 
   ON a1.userUUID= b.userUUID 
   JOIN userAttributes as a2 
   ON a2.userUUID = b.userUUID
   ```
   
   are displayed as:
   
   
![image](https://github.com/user-attachments/assets/a87d2319-4291-4a0e-8433-97e072007441)
   


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