Silence HTTP request logging in mock StaticHTTPServer for Bzlmod tests.

Bzlmod tests querying multiple registries trigger expected HTTP 404 responses on local mock registries before falling back to BCR. Python's `SimpleHTTPRequestHandler` logs each of these to stderr by default, dumping hundreds of kilobytes of 404 noise that flood CI logs and truncate failure output. Overriding `log_message` in `_Handler` silences this routine request traffic.

PiperOrigin-RevId: 972576849
Change-Id: I9b26db00c57f9e0ed3a7c576ea9da16b0d8f90cb

src/test/py/bazel/bzlmod/test_utils.py

diff --git a/src/test/py/bazel/bzlmod/test_utils.py b/src/test/py/bazel/bzlmod/test_utils.py
index 52c1f7d..6877d04 100644
--- a/src/test/py/bazel/bzlmod/test_utils.py
+++ b/src/test/py/bazel/bzlmod/test_utils.py
@@ -493,3 +493,8 @@
   def do_GET(self):
     if self.check_auth():
       return super().do_GET()
+
+  def log_message(self, *args, **kwargs):
+    # Suppress logging to prevent dumping hundreds of 404s to stderr
+    # when Bazel queries fallback registries.
+    pass