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refactor: Make lint names snake_case When working on #13621, I somehow missed that lint names should be `snake_case` according to the [`rustc-dev-guide`](https://rustc-dev-guide.rust-lang.org/diagnostics.html#lint-naming) as well as [`RFC #344`](https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints). This PR renames: - `implicit-features` => `implicit_featires` - `rust-2024-compatibility` => `rust_2024_compatibility`. <hr> Note: We should probably have some tooling to enforce this, but I was unsure if it belonged to this PR or another one. One solution would be to use a macro to create the `const LINT_NAME: Lint = {...}`, where `LINT_NAME` would be the `ident` as well as the `name: &'static str` and then have a method on `Lint` to make it lowercase as needed. This is what `rustc` does, and it could work well here. It would ensure snake case as `const` names need to be [`SCREAMING_SNAKE_CASE`](https://rust-lang.github.io/rfcs/0430-finalizing-naming-conventions.html#general-naming-conventions), or a warning is shown.