core: Limit terminal reset using ANSI sequences to /dev/console

core: Limit terminal reset using ANSI sequences to /dev/console

Doing this in reset_terminal_fd() is a bit too invasive, see
https://github.com/systemd/systemd/pull/32406#issuecomment-2070923583.

Let's only do this for /dev/console so that we work around weird firmwares
disabling line-wrapping, but avoid messing too much with other things.

While we're at it, let's handle more than just line wrapping, and do a
more general reset of stuff to get the terminal into a sane state.