Add Support for Unix Socket Connections in etcd Client #19760
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This pull request addresses #19704, which highlights the lack of support for connecting to etcd servers using the Unix socket format (unix://). The changes introduce support for Unix sockets, making it possible to leverage them in single-node etcd setups for local communication. The validation logic has been updated to allow Unix socket schemes while ensuring compatibility with the existing host:port format required for multi-node clusters.