Instead of panicking when trying to handle non utf8 lines we should
return `null` as line output.
This way we can on the frontend detect if a file has any lines the api
wasn't able to parse and fallback to show a file as a `Binary File`
We are returning `assignees` in patches as `Author` since March 2024, so
we should also parse patches with the correct zod schema.
This shouldn't break any up to date `radicle-httpd`
Sebastian Martinez