Fix hang on shutdown

[dmcgowan]

Fixes an issue that shows up when exiting a container with terminal attached. Currently docker run will hang on shutdown with the -t option. This was caused because the console was getting wrapped and causing the console not to shutdown, keeping stdout open.

[Copilot]

Pull Request Overview

This PR fixes a shutdown hang issue that occurs when exiting a container with a terminal attached (using the -t option in docker run). The hang was caused by the console being wrapped in a way that prevented proper shutdown, keeping stdout open indefinitely.

Key changes:

• Changed closingConsole to embed *console.EpollConsole directly instead of the console.Console interface, enabling direct access to the Shutdown method
• Updated ShutdownConsole to use duck typing via an anonymous interface, making it compatible with both *console.EpollConsole and *closingConsole
• Updated field initialization in CopyConsole to match the new struct field name

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