#27387)

## Summary
This PR fixes an issue where the is_release_build parameter was not
being correctly passed to the validate_package.py script across various
Azure Pipelines.

## Changes
- Updated the combined CUDA packaging stage and its sub-stages to pass
the IsReleaseBuild parameter through the template chain.
- Added missing IsReleaseBuild parameter definitions to following
templates:

tools/ci_build/github/azure-pipelines/stages/nuget-linux-cuda-packaging-stage.yml

tools/ci_build/github/azure-pipelines/stages/nuget-win-cuda-packaging-stage.yml
- Ensured all calls to validate-package.yml (including the main CUDA
NuGet stage) now explicitly pass the IsReleaseBuild flag.

## Context
It is based on #27382.