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fa0cc1c5a4 test: [doc] Remove outdated comment (MarcoFalke)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/ci-windows-cross.py

@@ -10,6 +10,9 @@ import subprocess
 import sys
 from pathlib import Path
 
+sys.path.append(str(Path(__file__).resolve().parent.parent / "test"))
+from download_utils import download_script_assets
+
 
 def run(cmd, **kwargs):
     print("+ " + shlex.join(cmd), flush=True)
@@ -81,6 +84,9 @@ def prepare_tests():
     run(cmd_download_prev_rel)
     run([sys.executable, "-m", "pip", "install", "pyzmq"])
 
+    dest = workspace / "unit_test_data"
+    download_script_assets(dest)
+
 
 def run_functional_tests():
     workspace = Path.cwd()
@@ -117,6 +123,8 @@ def run_functional_tests():
 
 
 def run_unit_tests():
+    workspace = Path.cwd()
+    os.environ["DIR_UNIT_TEST_DATA"] = str(workspace / "unit_test_data")
     # Can't use ctest here like other jobs as we don't have a CMake build tree.
     commands = [
         ["./bin/test_bitcoin-qt.exe"],