Update values.yaml and connectors_config.py for runtime and environment variable changes
- Renamed the runtime entry from "single" to "legacy" in values.yaml for clarity.
- Updated the helm upgrade command comment in values.yaml to reflect the correct path for deployment.
- Changed the environment variable name from "MLFLOW_HOST" and "MLFLOW_PORT" to "MLFLOW_URL" in connectors_config.py for consistency.
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