test: allow silencing curl connection failures on retry

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/infamy/util.py

@@ -99,12 +99,13 @@ def warn(msg):
     RST = "\033[0m"
     print(f"{YELLOW}warn - {msg}{RST}")
 
-def curl(url, timeout=10):
+def curl(url, timeout=10, silent=False):
     """Fetch a URL and return its response body as a UTF-8 string.
 
     Args:
         url (str): The full URL to fetch.
         timeout (int): Request timeout in seconds.
+        silent (bool): If True, suppress warning on failure (for retry scenarios).
 
     Returns:
         str | None: Response body as text, or None if the request failed.
@@ -115,5 +116,6 @@ def curl(url, timeout=10):
         with urllib.request.urlopen(url, timeout=timeout) as response:
             return response.read().decode('utf-8', errors='replace')
     except (urllib.error.URLError, ConnectionResetError, UnicodeEncodeError) as e:
-        print(f"[WARN] curl: failed to fetch {url}: {e}")
+        if not silent:
+            print(f"[WARN] curl: failed to fetch {url}: {e}")
         return ""