refactor(config): update deprecated field handling for remove_thinking_traces

[Pouyanpi]

This pull request makes several updates to the nemoguardrails/rails/llm/config.py file, focusing on improving deprecation handling, updating field configurations, and enhancing clarity in the codebase. The changes include replacing deprecated warnings with silent migrations, modifying field types, and cleaning up imports.

Deprecation handling improvements:

• Replaced the deprecated warning for the remove_thinking_traces field with a silent migration to the remove_reasoning_traces field in the _migrate_thinking_traces method. This simplifies the user experience by automatically propagating values without issuing warnings.

Field configuration updates:

• Updated the remove_thinking_traces field to include a deprecated attribute in its description, improving clarity on its deprecation status.
• Changed the apply_to_reasoning_traces field in the OutputRails class from bool to Optional[bool] to allow for more flexible configurations.

Code cleanup:

• Replaced the unused ValidationError import with Field to align with the updated field definitions.

[Copilot]

Pull Request Overview

This pull request refactors the configuration handling for deprecated fields and updates field types to improve clarity and functionality.

• Replaces the deprecated warning for remove_thinking_traces with a silent migration to remove_reasoning_traces.
• Updates the remove_thinking_traces field description to mark it as deprecated and adjusts types for specific fields.
• Cleans up unused imports and changes the type of apply_to_reasoning_traces from bool to Optional[bool].

Comments suppressed due to low confidence (1)

nemoguardrails/rails/llm/config.py:467

• Ensure that the change to Optional[bool] for apply_to_reasoning_traces is accompanied by any necessary adjustments in downstream code, as the new type may affect how its value is interpreted.

apply_to_reasoning_traces: Optional[bool] = Field(

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.43%. Comparing base (343b759) to head (1369279).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1196      +/-   ##
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- Coverage    68.43%   68.43%   -0.01%     
===========================================
  Files          161      161              
  Lines        15945    15943       -2     
===========================================
- Hits         10912    10910       -2     
  Misses        5033     5033              

Flag	Coverage Δ
python	68.43% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
nemoguardrails/rails/llm/config.py	89.96% <100.00%> (-0.04%)	⬇️

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