fix: Pipeline.upsert() TypeError (real agent 1773873366) (#66666)

[aviruthen]

Description

The Pipeline.create(), update(), upsert(), and put_triggers() methods accept role_arn typed as str but never validate its type. When a non-string value like a dict is passed, it propagates to the boto3 API call and raises an unhelpful TypeError. The fix is to add a _validate_role_arn() helper that checks isinstance(role_arn, str) after config resolution (but before the None check), and raises a clear ValueError with the parameter name and actual type. This validation should be added in all four methods after resolve_value_from_config() returns but before the existing 'not role_arn' check.

Related Issue

Fixes #66666

Changes Made

• src/sagemaker/workflow/pipeline.py
• tests/unit/sagemaker/workflow/test_pipeline.py

AI-Generated PR

This PR was automatically generated by the PySDK Issue Agent.

• Confidence score: 80%
• 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)