🧪 Add unit tests for wait_connected method in MQTT client

[manupawickramasinghe]

🎯 What: Added tests for the previously untested wait_connected method in the RuViewMqttClient.
📊 Coverage: Covered default timeout argument, custom timeout argument, and propagation of boolean return values representing connection success and timeout failure.
✨ Result: Increased unit test coverage and confidence in the MQTT client lifecycle methods without needing a real broker connection.

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PR created automatically by Jules for task 17413907925505756645 started by @manupawickramasinghe

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