[Build] Fix DML Nuget Pipeline for Release

[tianleiwu]

Description

This pull request addresses the issue where the DirectML NuGet pipeline has error like "##[error]A duplicate file name exists, or the file" in Windows_CI_GPU_DML_Dev_arm64 step.

Core Changes

1. Automation Script: Introduced bundle_dml_package.ps1 to orchestrate the merging process:
   • Extracts the base x64 .nupkg.
   • Merges ARM64 binaries from a supplemental build artifact into the runtimes/win-arm64/native directory.
   • Repackages the resulting structure into a unified .nupkg.
2. Pipeline Integration: Updated dml-nuget-packaging.yml to include a final NuGet_Packaging_DML stage. This stage is dependent on both the x64 and ARM64 build stages.
3. Extended Selection logic: Updated select_dml_package.ps1 to allow renaming artifacts (specifically for creating the supplemental ARM64 zip) and more robust package selection for development and release builds.
4. Validation Enhancements: Included updates to validate_package.py and validate-package.yml to support multi-platform verification in future pipeline runs.

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Verification Results

The bundling logic was verified through the pipeline logs in the NuGet_Packaging_DML stage.

Execution Logs

• Successful Extraction: The script correctly extracted the win-dml-arm64.zip and the base Microsoft.ML.OnnxRuntime.DirectML.1.24.1.nupkg.
• Injection Proof:
  • Created the runtimes/win-arm64/native directory inside the package extraction folder.
  • Copied onnxruntime.dll, onnxruntime.lib, and onnxruntime_providers_shared.dll into the ARM64 runtime path.
• Unified Package Creation: 7-Zip successfully created the new archive containing 34 files (up from 31 in the original x64-only package).
• Size Increase: The package size increased from ~6.6 MB to ~12.4 MB, reflecting the inclusion of binaries for both architectures.

Important

Artifact Note: When verifying the CI output, the unified multi-arch package is located in the packages artifact produced by the NuGet_Packaging_DML stage. Intermediate artifacts like drop-nuget-dml still contain the single-architecture (x64) version.