Expand parents whenever open-parenthesis comments are present (#6389)

## Summary

This PR modifies our dangling-open-parenthesis handling to _always_
expand the parent expression.

So, for example, given:

```python
a = int(  # type: ignore
    int(  # type: ignore
        int(  # type: ignore
            6
        )
    )
)
```

We now retain that as stable formatting, instead of truncating like:

```python
a = int(int(int(6)))  # comment  # comment  # comment
```

Note that Black _does_ collapse comments like this _unless_ they're `#
type: ignore` comments, and perhaps in some other cases, so this is an
intentional deviation
([playground](https://black.vercel.app/?version=main&state=_Td6WFoAAATm1rRGAgAhARYAAAB0L-Wj4AFEAHpdAD2IimZxl1N_WlOfrjryFgvD4ScVsKPztqdHDGJUg5knO0JCdpUfW1IrWSNmIJPx95s0hP-pRNkCQNH64-eIznIvXjeWBQ5-qax0oNw4yMOuhwr2azvMRZaEB5r8IXVPHmRCJp7fe7y4290u1zzxqK_nAi6q_5sI-jsAAAAA8HgZ9V7hG3QAAZYBxQIAAGnCHXexxGf7AgAAAAAEWVo=)).

crates/ruff_python_formatter/src/comments/format.rs

@@ -260,11 +260,10 @@ impl Format<PyFormatContext<'_>> for FormatDanglingOpenParenthesisComments<'_> {
 
             write!(
                 f,
-                [line_suffix(&format_args![
-                    space(),
-                    space(),
-                    format_comment(comment)
-                ])]
+                [
+                    line_suffix(&format_args![space(), space(), format_comment(comment)]),
+                    expand_parent()
+                ]
             )?;
             comment.mark_formatted();