IGNITE-17513 [ducktests] Set locale to c.utf-8 in docker image

[skorotkov]

In docker image update the environment of the program started via the SSH to use the UTF-8 locale instead of the default POSIX one. In particular the LANG=C.UTF-8 was added into the /home/ducker/.ssh/environment file.

This is needed for example to pass the password with non-ascii symbols to control.sh

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