Rollup merge of #123101 - Bryanskiy:delegation-fixes-2, r=petrochenkov

Delegation: fix ICE on wrong `Self` instantiation

fixes https://github.com/rust-lang/rust/issues/119921
fixes https://github.com/rust-lang/rust/issues/119919

There is no way to instantiate `Self` param for caller in delegation item if

1. callee is a trait method && callee contains `Self` param
2. delegation item isn't an associative item

In general, we can consider `Self` param as independent type param in these cases:

```rust

trait Trait {
    fn foo(_: Option<&Self>) {...}
}

reuse Trait::foo;
// will be desugared to:
fn foo<T: Trait>(x: Option<&T>) { Trait::foo(x) }
```

But this requires early bound parameters support. For now, I suggest banning such cases to avoid ICE's.

r? ``@petrochenkov``

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