fix: ModelBuilder.build() fails when image_uri is a ParameterString (V2 -> V3 migrati (5760)

[sagemaker-bot]

Description

AI-generated fix.

Related Issue

Related issue: 5760

Changes Made

• sagemaker-serve/src/sagemaker/serve/validations/check_image_uri.py
• sagemaker-serve/src/sagemaker/serve/validations/check_image_and_hardware_type.py
• sagemaker-serve/tests/unit/validations/test_check_image_uri.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 93.76%. Comparing base (e6905ed) to head (a684d35).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5910      +/-   ##
==========================================
+ Coverage   89.97%   93.76%   +3.79%     
==========================================
  Files         286      188      -98     
  Lines       39217    24012   -15205     
==========================================
- Hits        35286    22516   -12770     
+ Misses       3931     1496    -2435     

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