Update VCPKG to 25.08.27 (#26839)
### Description
Executive Summary
The PR successfully updates the VCPKG baseline and Abseil dependency to version 20250814.0. A significant improvement is the introduction of a dynamic dependency resolution script for Abseil. There are also substantial refactoring changes in the WebGPU provider build logic which appear to be bundled with this update.
Key Changes Verified
1. VCPKG & Abseil Update
VCPKG Baseline: Updated to 120deac3062162151622ca4860575a33844ba10b in cmake/vcpkg-configuration.json.
Abseil Port: cmake/vcpkg-ports/abseil/vcpkg.json and portfile.cmake correctly updated to version 20250814.0.
Dependencies: cmake/deps.txt reflects the correct URL and hash for the new Abseil version.
2. Dependency Management
New Tool: tools/python/resolve_absl_deps_dynamic.py has been added.
Review:
This is a robust script that automatically resolves and topologically sorts Abseil dependencies by parsing CMake lists. This is a great addition for maintainability, replacing the manual list management.
CMake Integration: cmake/external/abseil-cpp.cmake has been updated to use the new list of components, consistent with the script's output.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
---------
Co-authored-by: Changming Sun <chasun@microsoft.com>
Co-authored-by: Gemini <gemini@google.com>
