[MOD1RCU9-11] add testcasefor example onnx_ptq

[joe0731]

What does this PR do?

Type of change: ? add new tests

Overview: ?
add test coverage for the ONNX-PTQ examples part

Key Improvements:

• comprehensive test coverage: added 5 new test suites covering different ONNX PTQ scenarios
• better organization: split tests by functionality (LLM, timm, autocast, plugins, general)
• reusable run_cmd: Created utility modules (onnx_path.py, enhanced run_command.py) for easier test development
• TRT plugins parts: tests cover real-world use cases including custom TRT plugins and various model types
  .

Testing

export MODELOPT_LOCAL_MODEL_ROOT=/models/ && pytest tests/examples/onnx_ptq/ -vv -s -rA

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• Is this change backward compatible?: Yes/No
• Did you write any new necessary tests?: Yes/No
• Did you add or update any necessary documentation?: Yes/No
• Did you update Changelog?: Yes/No

Additional Information

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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