chore: replace half-baked eslint setup with oxlint

[serhalp]

We had set up eslint in this repo after the fact, but in the interest of time we hadn't quite set it up correctly, we hadn't curated plugins and rules to enable, and we had suppressed hundreds of errors.

By now, oxlint is stable and solid: https://oxc.rs/docs/guide/usage/linter.html. And it's extremely fast. So this PR revamps the linting setup to use oxlint.

oxlint has the concept of rule "categories". This PR only enables all the "correctness" rules. These all catch definite errors. We can always add more later.

Tip

The first time you work in a codebase that uses oxlint, you may need to install a new extension in your IDE: https://oxc.rs/docs/guide/usage/linter/editors.html.

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