nixos-rebuild: Add proper escaping to ssh calls

SSH merges its arguments by space-concatenation - it does not preserve
the array structure.

This is arguably a historic mistake, whose fix would be too breaking.
I suppose it will stay this way forever, until perhaps a better behavior
can be opted in to using a flag, and I don't think this flag exists yet.

To make multi-argument commands work reliably over ssh, we need to escape
them, which is what the ${@@Q} incantation achieves.

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