Ensure Final Newline in .json File Generation Process

## Summary
The current process responsible for generating .json files is not adding a final newline at the end of the file. This missing newline can cause issues with certain tools that rely on this newline for correct parsing. To prevent potential problems, we need to update the generation process to include a final newline in the .json files it generates.

## Tasks
- [ ] Investigate the current implementation of the .json file generation process
- [ ] Modify the process to append a final newline character at the end of the generated .json files
- [ ] Test the updated process to ensure the newline is correctly added and does not impact the existing functionality
- [ ] Document the changes made to the .json file generation process

## PR related
- [ ] ai-cfia/ailab-db#96
- [x] ai-cfia/api-test#16
## Acceptance Criteria
- .json files generated by the process should include a final newline character at the end of the file
- The updated process should not introduce any regressions or impact existing functionality
- Documentation should be updated to reflect the changes made to the .json file generation process