make cli overload error have newline

[asukaminato0721]

part of #955

pipe to bat, then we have syntax highlight now.

./target/debug/pyrefly check ./tmp.py | bat -l py

[rchen152]

I'm a little worried about how long this would make the [no-matching-overload] error message. I agree that the line breaks make the individual signatures more readable, but this could easily turn, say, a 10-line message into a 100-line one. And I assume the syntax highlighting doesn't show up unless you do an extra step of piping to bat, so it wouldn't be there by default to help with parsing the output?

I wonder if it would be better to instead implement the other suggestion in #955, hiding unrelated fields. That could make these messages more readable without increasing their length.