Match ergonomics 2024: align implementation with RFC - Remove eat-two-layers (`ref_pat_everywhere`) - Consolidate `mut_preserve_binding_mode_2024` into `ref_pat_eat_one_layer_2024` - `&mut` no longer peels off `&` - Apply "no `ref mut` behind `&`" rule on all editions with `ref_pat_eat_one_layer_2024` - Require `mut_ref` feature gate for all mutable by-reference bindings r? ``@Nadrieril`` cc https://github.com/rust-lang/rust/issues/123076 ``@rustbot`` label A-edition-2024 A-patterns