Add filtered_txn.zip feature for VitisAI

[anilmartha]

Summary

• Add optional filtered_zip_path parameter to the VitisGenerateModelLLM pass to automatically copy filtered transaction data (e.g. filtered_txn.zip) into the model output directory during NPU model generation
• When filtered_zip_path is specified in the pass config, the file is copied to the output directory after generate_npu_model completes, enabling a single-step pipeline for VitisAI NPU deployment

Changes

File	Change
olive/passes/onnx/vitis_ai/vitis_generate_model_llm.py	Added shutil import, new optional filtered_zip_path config parameter, and post-generation copy logic

Details

• filtered_zip_path is an optional str parameter (defaults to None), so existing configs are unaffected
• When provided, the pass resolves the path, validates the file exists, and copies it into the output directory alongside the generated model
• Raises FileNotFoundError if the specified file does not exist

Test plan

• Run olive run --config Llama-3.1-8B-Instruct_quark_vitisai_llm.json with filtered_zip_path set and verify the zip is copied to the output directory
• Run an existing config without filtered_zip_path and verify no regression (pass behaves as before)

[anilmartha]

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