fix(models): suppress langchain_nvidia_ai_endpoints warnings

[Pouyanpi]

suppress langchain_nvidia_ai_endpoints warnings

irtualenvs/nemoguardrails-O6aG79rF-py3.12/lib/python3.12/site-packages/langchain_nvidia_ai_endpoints/_common.py:212: UserWarning: Found nvidia/llama-3.1-nemoguard-8b-content-safety in available_models, but type is unknown and inference may fail.
  warnings.warn(
/Users/prezakhani/Library/Caches/pypoetry/virtualenvs/nemoguardrails-O6aG79rF-py3.12/lib/python3.12/site-packages/langchain_nvidia_ai_endpoints/_common.py:212: UserWarning: Found nvidia/llama-3.1-nemoguard-8b-topic-control in available_models, but type is unknown and inference may fail.
  warnings.warn(

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.62%. Comparing base (960e0b8) to head (234715a).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1371   +/-   ##
========================================
  Coverage    71.62%   71.62%           
========================================
  Files          171      171           
  Lines        17020    17021    +1     
========================================
+ Hits         12191    12192    +1     
  Misses        4829     4829           

Flag	Coverage Δ
python	71.62% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
nemoguardrails/llm/models/langchain_initializer.py	89.60% <100.00%> (+0.08%)	⬆️

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[tgasser-nv]

Thanks for the quick fix, this will clean up the logs nicely