Improve Nuget-CUDA-Packaging-Pipeline

[skottmckay]

Description

• Publish the artifacts as late as possible
  • once published the artifacts are immutable, and any retry will fail if they exist
  • if any step fails after publishing the stage cannot be retried
• use powershell to cleanup
  • DeleteFiles is taking >30 mins and causing the stage to timeout
  • powershell took < 1s

Motivation and Context

Make pipeline more robust