test: move-only download_from_url to stand-alone util file

Can be reviewed via --color-moved=dimmed-zebra

test/download_utils.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+import time
+import urllib.request
+
+
+def download_from_url(url, archive):
+    last_print_time = time.time()
+
+    def progress_hook(progress_bytes, total_size):
+        nonlocal last_print_time
+        now = time.time()
+        percent = min(100, (progress_bytes * 100) / total_size)
+        bar_length = 40
+        filled_length = int(bar_length * percent / 100)
+        bar = '#' * filled_length + '-' * (bar_length - filled_length)
+        if now - last_print_time >= 1 or percent >= 100:
+            print(f'\rDownloading: [{bar}] {percent:.1f}%', flush=True, end="")
+            last_print_time = now
+
+    with urllib.request.urlopen(url) as response:
+        if response.status != 200:
+            raise RuntimeError(f"HTTP request failed with status code: {response.status}")
+
+        sock_info = response.fp.raw._sock.getpeername()
+        print(f"Connected to {sock_info[0]}")
+
+        total_size = int(response.getheader("Content-Length"))
+        progress_bytes = 0
+
+        with open(archive, 'wb') as file:
+            while True:
+                chunk = response.read(8192)
+                if not chunk:
+                    break
+                file.write(chunk)
+                progress_bytes += len(chunk)
+                progress_hook(progress_bytes, total_size)
+
+        if progress_bytes < total_size:
+            raise RuntimeError(f"Download incomplete: expected {total_size} bytes, got {progress_bytes} bytes")
+
+    print('\n', flush=True, end="") # Flush to avoid error output on the same line.