Block sockets for unit-tests (#4803)

# Block usage of sockets during unit tests

Catch any tests that attempt to use the network.

tests/unit_tests/test_pytest_config.py

@@ -0,0 +1,9 @@
+import pytest
+import pytest_socket
+import requests
+
+
+def test_socket_disabled() -> None:
+    """This test should fail."""
+    with pytest.raises(pytest_socket.SocketBlockedError):
+        requests.get("https://www.example.com")