Rollup merge of #135865 - zachs18:maybe_report_similar_assoc_fn_more, r=compiler-errors

For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks.

Currently, the "help: there is an associated function with a similar name `from_utf8`" suggestion for `String::from::utf8` is only given if `String` has exactly one inherent `impl` item. This PR makes the suggestion be emitted even if the base type has multiple inherent `impl` items.

Example:

```rust
struct Foo;
impl Foo {
    fn bar_baz() {}
}
impl Foo {} // load-bearing
fn main() {
    Foo::bar::baz;
}
```

Nightly/stable output:

```rust
error[E0223]: ambiguous associated type
 --> f.rs:7:5
  |
7 |     Foo::bar::baz;
  |     ^^^^^^^^
  |
help: if there were a trait named `Example` with associated type `bar` implemented for `Foo`, you could use the fully-qualified path
  |
7 |     <Foo as Example>::bar::baz;
  |     ~~~~~~~~~~~~~~~~~~~~~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0223`.
```

Output with this PR, or without the load-bearing empty impl on nightly/stable:

```rust
error[E0223]: ambiguous associated type
 --> f.rs:7:5
  |
7 |     Foo::bar::baz;
  |     ^^^^^^^^
  |
help: there is an associated function with a similar name: `bar_baz`
  |
7 |     Foo::bar_baz;
  |          ~~~~~~~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0223`.
```

Ideally, this suggestion would also work for non-ADT types like ~~`str::char::indices`~~ (edit: latest commit makes this work with primitives)  or `<dyn Any>::downcast::mut_unchecked`, but that seemed to be a harder change.

`@rustbot` label +A-diagnostics

Author: matthiaskrgr