test: added test configuration to always mock zmq context to fix zmq port congestion issues

ref: N25B-386

test/conftest.py

@@ -0,0 +1,10 @@
+from mock import patch, MagicMock
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def mock_zmq_context():
+    with patch("zmq.Context") as mock:
+        mock.instance.return_value = MagicMock()
+        yield mock