Integration with ONNX==1.20.0

[titaiwangms]

Description

NOTE: Need #26597

Motivation and Context

[snnn]

There appears to be a gap in the vcpkg configuration for native Linux builds regarding the protobuf library version.

The generated triplet file (e.g., x64-linux.cmake) does not currently receive a setting for ONNX_USE_LITE_PROTO.

This is because the logic in tools/python/util/vcpkg_helpers.py that adds -DONNX_USE_LITE_PROTO=ON is specific to WebAssembly builds, as shown in the add_port_configs function:

    if is_emscripten:
        # Uses ONNX_USE_LITE_PROTO=ON for WebAssembly build.
        f.write(
            r"""
    list(APPEND VCPKG_CMAKE_CONFIGURE_OPTIONS
        "-DONNX_USE_LITE_PROTO=ON"
    )"""
        )

For native Linux builds, is_emscripten is False, so this block is skipped. As a result, the onnx dependency falls back to its default (ONNX_USE_LITE_PROTO=OFF), causing a mismatch with the ONNX Runtime default build which expects the lite version. This should be addressed to ensure native builds are configured correctly.