Merge bitcoin/bitcoin#34883: ci: vcpkg-specific cleanups

2d5cedfe12 ci: Switch to VS-vendored vcpkg instance (Hennadii Stepanov)
9aa5b3c3a3 ci: Switch to `x64-windows-release` triplet (Hennadii Stepanov)
65882fa68f ci: Remove upstreamed vcpkg workaround (Hennadii Stepanov)

Pull request description:

  This PR removes three vcpkg-specific workarounds. See the commit messages for more details.

ACKs for top commit:
  janb84:
    Concept ACK 2d5cedfe12
  hodlinator:
    utACK 2d5cedfe12

Tree-SHA512: 72155eea5210ff001df8fd05ec82687ab5cef65e0e89e7ab79a59ff90da51e5c7c790a41c6c755463b3dba0fdc5561ea9eb410fd69d4a6682f645d72028b3c48

.github/ci-windows.py

@@ -71,8 +71,8 @@ def generate(ci_type):
         "-B",
         "build",
         "-Werror=dev",
-        "--preset",
-        "vs2026",
+        "--preset=vs2026",
+        "-DVCPKG_TARGET_TRIPLET=x64-windows-release",
     ] + GENERATE_OPTIONS[ci_type]
     if run(command, check=False).returncode != 0:
         print("=== ⚠️ ===")

.github/workflows/ci.yml

@@ -253,21 +253,11 @@ jobs:
           py -3 --version
           bash --version
 
-      - name: Using vcpkg with MSBuild
-        run: |
-          echo "set(VCPKG_BUILD_TYPE release)" >> "${VCPKG_INSTALLATION_ROOT}/triplets/x64-windows.cmake"
-          # Workaround for libevent, which requires CMake 3.1 but is incompatible with CMake >= 4.0.
-          sed -i '1s/^/set(ENV{CMAKE_POLICY_VERSION_MINIMUM} 3.5)\n/' "${VCPKG_INSTALLATION_ROOT}/scripts/ports.cmake"
-
-      - name: Set VCPKG_ROOT
-        run: |
-          echo "VCPKG_ROOT=${VCPKG_INSTALLATION_ROOT}" >> "$GITHUB_ENV"
-
       - name: Restore vcpkg tools cache
         id: vcpkg-tools-cache
         uses: actions/cache/restore@v5
         with:
-          path: C:/vcpkg/downloads/tools
+          path: ~/AppData/Local/vcpkg/downloads/tools
           key: ${{ github.job }}-vcpkg-tools-${{ github.run_id }}
           restore-keys: ${{ github.job }}-vcpkg-tools-
 
@@ -294,7 +284,7 @@ jobs:
         # Only save cache from one job as they share tools. If the matrix is expanded to jobs with unique tools, this may need amending.
         if: github.event_name != 'pull_request' && github.ref_name == github.event.repository.default_branch && steps.vcpkg-tools-cache.outputs.cache-hit != 'true' && matrix.job-type == 'standard'
         with:
-          path: C:/vcpkg/downloads/tools
+          path: ~/AppData/Local/vcpkg/downloads/tools
           key: ${{ github.job }}-vcpkg-tools-${{ github.run_id }}
 
       - name: Build