feat(mqtt): port 9 MQTT cluster tests from Go to .NET integration tests
Add MqttClusterTests.cs with 8 cluster tests (T:2215-2224) and relocate T:2225 from ImplBacklog stub. All tests deferred (require running cluster).
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Add MqttClusterTests.cs with 8 cluster tests (T:2215-2224) and relocate T:2225 from ImplBacklog stub. All tests deferred (require running cluster).