ci: Refactor Windows CI into script

This makes it easier to:

* Run the exact command of any CI type and step locally
* Re-Run older CI tasks on GHA and using the latest merged config.
  (.github/ci-windows.py is merged with master on re-runs, but
  .github/workflows/ci.yml is NOT)

Also, writing it in Python has benefits:

* Any developer (even non-Windows ones) can read and modify the script.
* Python is already required for tests, so no new dependency is needed.

.github/workflows/ci.yml

@@ -218,10 +218,8 @@ jobs:
         job-type: [standard, fuzz]
         include:
           - job-type: standard
-            generate-options: '-DBUILD_BENCH=ON -DBUILD_KERNEL_LIB=ON -DBUILD_UTIL_CHAINSTATE=ON -DCMAKE_COMPILE_WARNING_AS_ERROR=ON'
             job-name: 'Windows native, VS 2022'
           - job-type: fuzz
-            generate-options: '-DVCPKG_MANIFEST_NO_DEFAULT_FEATURES=ON -DVCPKG_MANIFEST_FEATURES="wallet" -DBUILD_GUI=OFF -DWITH_ZMQ=OFF -DBUILD_FOR_FUZZING=ON -DCMAKE_COMPILE_WARNING_AS_ERROR=ON'
             job-name: 'Windows native, fuzz, VS 2022'
 
     steps:
@@ -272,7 +270,7 @@ jobs:
 
       - name: Generate build system
         run: |
-          cmake -B build -Werror=dev --preset vs2022 -DCMAKE_TOOLCHAIN_FILE="${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" ${{ matrix.generate-options }}
+          py -3 .github/ci-windows.py ${{ matrix.job-type }} generate
 
       - name: Save vcpkg binary cache
         uses: actions/cache/save@v4