fix: LocalPipelineSession mutates sagemaker_client by injecting _pipelines attribute (5604)

[sagemaker-bot]

Description

AI-generated fix.

Related Issue

Related issue: 5604

Changes Made

• sagemaker-mlops/src/sagemaker/mlops/local/local_pipeline_session.py
• sagemaker-mlops/tests/unit/local/test_local_pipeline_session.py

AI-Generated PR

This PR was automatically generated by the PySDK Issue Agent.

• Confidence score: 95%
• Classification: bug
• SDK version target: V3

Merge Checklist

• Changes are backward compatible
• Commit message follows prefix: description format
• Unit tests added/updated
• Integration tests added (if applicable)
• Documentation updated (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.24%. Comparing base (e6905ed) to head (7f22eb1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5915      +/-   ##
==========================================
- Coverage   89.97%   87.24%   -2.74%     
==========================================
  Files         286       84     -202     
  Lines       39217     9102   -30115     
==========================================
- Hits        35286     7941   -27345     
+ Misses       3931     1161    -2770     

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