nixos-rebuild: Add tty only to "sudo-able" commands for target

This solves again the problem solved by 09fd207cb8a6a1e654cdc9dc49610ebd456fe05d.

To quote:

> We always want to use `ssh -t` to force PTY allocation as there may be
> interactive SSH prompts like trusting unknown hosts.

However, the creation of a pseudoterminal causes the remote stdout and stderr
to point to the same tty, resulting in a single stream in the ssh client,
which breaks other usages of ssh, such as `--build-host`.

Hence, this commit only sets the flag for invocations that need it -
or would need it if sudo were disabled. That should help with development
and gives a somewhat more consistent user experience.

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