Rollup merge of #125168 - Jules-Bertholet:match-ergonomics-2024-align-with-rfc, r=Nadrieril

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 rust-lang/rust#123076

``@rustbot`` label A-edition-2024 A-patterns

Author: matthiaskrgr