[PR] feat: add automated backport workflow [lucene]

[via GitHub]

ayagmar opened a new pull request, #14738:
URL: https://github.com/apache/lucene/pull/14738

   Add GitHub Actions workflow for automatic PR backporting with intelligent 
branch detection, conflict handling, and comprehensive error reporting. 
Supports multiple branch naming patterns and provides detailed feedback via 
comments.
   
   ### 🔧 Requirements
   
   Enable "Allow GitHub Actions to create and approve pull requests" in 
repository settings is enabled
   
   
   ### 🚀 Usage
   
   1. Add backport labels to your PR (e.g., `backport/v1.0`, `backport/13.1`)
   2. Merge the PR
   3. Workflow automatically creates backport PRs to target branches
   4. Review and merge the generated backport PRs
   
   ### 🏷️ Supported Label Format
   
   - `backport/1.0` → looks for `branch_1_0`, `release/1.0`, `v1.0`, etc.
   - `backport/13.1` → looks for `branch_13_1`, `release/13.1`, `v13.1`, etc.
   - Case-insensitive: `Backport/` also works
   
   
   ### 🧪 Testing : 
   Tested with multiple scenarios:
   - ✅ Single successful backport
   - ✅ Multiple backports (mixed success/failure)
   - ✅ Missing target branches (graceful failure)
   - ✅ Cherry-pick conflicts (manual resolution guide)
   - ✅ Duplicate PR detection
   
   Created A pull request to main, with two labels. backport/existing_branch 
and backport/branch_does_not_exist
   
![{0AC14E21-C311-468F-836E-91B50DFB7683}](https://github.com/user-attachments/assets/c9197b88-d7b0-4b27-a0dc-6a94bcb0e913)
   PR is created to the existing branch 
   
![{9F4B2AEC-EED0-4C46-A401-615E7EFB4D2D}](https://github.com/user-attachments/assets/3bca0808-36b9-4f32-89cc-5405ebe8560c)
   Comment is added on main PR to specify one branch was not found 
   Logs
   
![{09066F7F-C7D4-4E8D-8198-7BD1C9809B0A}](https://github.com/user-attachments/assets/bd512b8b-ec18-4b1c-bdf6-6e023e903f8e)
   
   


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