Add custom model path support for unit tests

[mpasumarthi-git]

Add support for custom model paths in unit tests via command-line argument

• Added --model_path argument to unit_tests.exe to specify custom model locations
• Updated test/main.cpp to parse the custom model path argument
• Updated test/model_tests.cpp, test/sampling_benchmark.cpp, and test/sampling_tests.cpp to use custom paths for NvTensorRT tests
• Allows running tests with models in non-default locations

[mpasumarthi-git]

@anujj Please help review

[baijumeswani]

Is there an external script that is used to call the unit tests that passes in different models to the test? What is the use case of passing in a custom model?

[mpasumarthi-git]

Is there an external script that is used to call the unit tests that passes in different models to the test? What is the use case of passing in a custom model?

Our CI deploys models to custom paths, so we need to pass the location at runtime rather than hardcoding paths.