Ruff everything

[msaroufim]

Description

This PR is a 1 time lint job so the repo is now in a state where the code style can stay consistent. I'm doing it now because the more we delay it the more annoying things become. Let's please merge this asap, otherwise I'll have to relint

1. So we introduce a new job called ``lint.yml` which fails if code is not linted
2. Locally developers should ruff check . to see which failures they need to fix
3. We can add or remove new linting rules in .ruff.toml

Some important fixes

1. we were returning in finally blocks which would swallow all errors so rewrote those away
2. We had some long lines I rewrote or broke apart. The max line limit is still too long and it's worth trying to get it below 100 for a future PR
3. I deleted a testing file called github_only which we're not really using anymore

Checklist

1. I ran run modal which worked https://discord.com/channels/1303055581078093874/1305687036723859587/1318054635969183756
2. I ran run github which worked https://discord.com/channels/1303055581078093874/1318057422367100938/1318057425546383381