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33967d47 - Add support for standalone mode when default port is occupied on single node (#3576)

Add support for standalone mode when default port is occupied on single node (#3576) * add standalone mode and replace ConnectionError with a warning when the main process port is in use, allowing for automatic port selection * address review feedback: warn on port conflict only for single-node; raise error for multi-node * Apply style fixes --------- Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>