Flaky test: test_websocket_multiple_connections, raises startlette.websockets.WebSocketDisconnect

[berland]

2025-03-04T09:33:54.2398846Z =================================== FAILURES ===================================
2025-03-04T09:33:54.2399491Z _____________________ test_websocket_multiple_connections ______________________
2025-03-04T09:33:54.2400219Z [gw0] linux -- Python 3.11.11 /home/runner/work/ert/ert/.venv/bin/python3
2025-03-04T09:33:54.2400659Z 
2025-03-04T09:33:54.2400987Z monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x7f430cacfed0>
2025-03-04T09:33:54.2401747Z setup_client = <function setup_client.<locals>.func at 0x7f430ca95260>
2025-03-04T09:33:54.2402174Z 
2025-03-04T09:33:54.2402482Z     def test_websocket_multiple_connections(monkeypatch, setup_client):
2025-03-04T09:33:54.2403104Z         client, subscribers = setup_client()
2025-03-04T09:33:54.2404056Z         credentials = b64encode(b"username:password").decode()
2025-03-04T09:33:54.2404784Z         with client.websocket_connect(
2025-03-04T09:33:54.2405314Z             "/events", headers={"Authorization": f"Basic {credentials}"}
2025-03-04T09:33:54.2405834Z         ) as websocket:
2025-03-04T09:33:54.2406396Z >           event = websocket.receive_json()
2025-03-04T09:33:54.2406693Z 
2025-03-04T09:33:54.2406991Z /home/runner/work/ert/ert/tests/everest/test_everserver.py:267: 
2025-03-04T09:33:54.2407606Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2025-03-04T09:33:54.2408467Z /home/runner/work/ert/ert/.venv/lib/python3.11/site-packages/starlette/testclient.py:183: in receive_json
2025-03-04T09:33:54.2409275Z     self._raise_on_close(message)
2025-03-04T09:33:54.2409699Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2025-03-04T09:33:54.2410005Z 
2025-03-04T09:33:54.2410337Z self = <starlette.testclient.WebSocketTestSession object at 0x7f430c447850>
2025-03-04T09:33:54.2411074Z message = {'code': 1008, 'reason': '', 'type': 'websocket.close'}
2025-03-04T09:33:54.2411572Z 
2025-03-04T09:33:54.2411815Z     def _raise_on_close(self, message: Message) -> None:
2025-03-04T09:33:54.2412319Z         if message["type"] == "websocket.close":
2025-03-04T09:33:54.2413053Z >           raise WebSocketDisconnect(code=message.get("code", 1000), reason=message.get("reason", ""))
2025-03-04T09:33:54.2413783Z E           starlette.websockets.WebSocketDisconnect
2025-03-04T09:33:54.2414096Z 
2025-03-04T09:33:54.2415513Z /home/runner/work/ert/ert/.venv/lib/python3.11/site-packages/starlette/testclient.py:136: WebSocketDisconnect
2025-03-04T09:33:54.2416415Z =============================== warnings summary ===============================
2025-03-04T09:33:54.2416938Z tests/everest/test_api_snapshots.py: 9 warnings

[berland]

Happened in https://github.com/equinor/ert/actions/runs/13650456212/job/38157611412?pr=10200