Merge bitcoin/bitcoin#34679: ci: Download script_assets_test.json for Windows CI

fa7612f253 ci: Download script_assets_test.json for Windows CI (MarcoFalke)
7777a13306 test: Move Fetching-print to download_from_url util (MarcoFalke)
faf96286ce test: move-only download_from_url to stand-alone util file (MarcoFalke)
fa0cc1c5a4 test: [doc] Remove outdated comment (MarcoFalke)

Pull request description:

  Fixes https://github.com/bitcoin/bitcoin/issues/34670 by adding a new `download_script_assets` Python helper and calling it.

ACKs for top commit:
  hebasto:
    re-ACK fa7612f253.
  janb84:
    re ACK fa7612f253
  hodlinator:
    utACK fa7612f253

Tree-SHA512: 73c2cb3a31f231174566fb880b82de92734b1679ef000f8d793d774b7e5f5a7b8c7994a3998ca78821115bdc80c16aada69cf596e92c083cf9b9a95c7cee16ea

.github/workflows/ci.yml

@@ -428,13 +428,12 @@ jobs:
       - name: Check executable manifests
         run: py -3 .github/ci-windows-cross.py check_manifests
 
+      - name: Prepare Windows test environment
+        run: py -3 .github/ci-windows-cross.py prepare_tests
+
       - name: Run unit tests
         run: py -3 .github/ci-windows-cross.py run_unit_tests
 
-      - name: Prepare Windows test environment
-        run: |
-          py -3 .github/ci-windows-cross.py prepare_tests
-
       - name: Run functional tests
         env:
           TEST_RUNNER_EXTRA: "--timeout-factor=${{ env.TEST_RUNNER_TIMEOUT_FACTOR }} ${{ case(github.event_name == 'pull_request', '', '--extended') }}"