feat: Improve data handling and text formatting (loop fix)

[Cristhianzl]

This pull request includes several changes to improve the handling of data and text formatting in the langflow backend. The most important changes include updates to the data_to_text_list function, enhancements to the LoopComponent class, and the addition of new tests for the data_to_text_list function.

Improvements to data handling and text formatting:

• src/backend/base/langflow/helpers/data.py: Refactored the data_to_text_list function to handle various data structures, support nested dictionaries, and use safe string formatting with fallbacks for missing keys. Added detailed docstrings and examples for better understanding.

Enhancements to loop component:

• src/backend/base/langflow/components/logic/loop.py: Modified the evaluate_stop_loop method to simplify the condition for stopping the loop.
• src/backend/base/langflow/initial_setup/starter_projects/LoopTemplate.json: Updated the LoopComponent class to reflect the changes in the evaluate_stop_loop method.

Addition of new tests:

• src/backend/tests/unit/helpers/test_data_to_text_list.py: Added comprehensive tests for the data_to_text_list function, covering various input combinations, error handling, and edge cases.

Additional imports:

• src/backend/base/langflow/helpers/data.py: Added imports for defaultdict, Union, Tuple, and List to support the refactored data_to_text_list function.

[codspeed-hq]

CodSpeed Performance Report

Merging #6771 will not alter performance

_{Comparing cz/fix-data-to-text-list (711fa7a) with main (05935ed)}

Summary

✅ 14 untouched benchmarks