[PR] Add new parameter in Table Rebalance API: Disk Utilization Pre-check Threshold Override [pinot]

[via GitHub]

J-HowHuang opened a new pull request, #16144:
URL: https://github.com/apache/pinot/pull/16144

   ## Overview
   Added support for overriding the default disk utilization threshold during 
table rebalance operations, allowing users to customize disk space checks on a 
per-rebalance basis.
   
   ### Backend Changes
   - **RebalanceConfig**: Added `diskUtilizationThreshold` field (double, 
default: -1.0)
   - **Rebalance API**: New query parameter `diskUtilizationThreshold` in `POST 
/tables/{tableName}/rebalance`
   - **Pre-checker**: Updated `DefaultRebalancePreChecker` to use override 
threshold when provided
   - **Variable Rename**: `_diskUtilizationThreshold` → 
`_defaultDiskUtilizationThreshold` for clarity in `DefaultRebalancePreChecker`
   
   ### API Usage
   ```bash
   POST /tables/myTable/rebalance?type=OFFLINE&diskUtilizationThreshold=0.85
   ```
   
   ### UI Changes
   - Added "Disk Utilization Threshold" field to Advanced Options in rebalance 
dialog
   - New DOUBLE input component for decimal values (0.0-1.0 range)
   
   ### Behavior
   - **Default (-1.0)**: Uses controller's configured threshold (the approach 
before this PR)
   - **Override (>=0.0)**: Uses specified threshold (e.g., 0.85 = 85%)
   
   ## Rebalance UI
   
![image](https://github.com/user-attachments/assets/248b276d-49fb-458e-9696-cbb9a40028ae)
   When the value is default (-1.0)
   <img width="224" alt="image" 
src="https://github.com/user-attachments/assets/b65eb0cc-3360-41bc-bd79-045b48fae263";
 />
   When the value is 0.2
   
![image](https://github.com/user-attachments/assets/392fec4d-9b58-4089-b57e-96f5f8573db6)
   When the value is 15 (no check on this value, though)
   
![image](https://github.com/user-attachments/assets/68045a7f-faf5-4d9a-a168-1366c5c0ca0c)
   


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