Preserve dangling f-string comments

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## Summary

This PR fixes the issue where the FString formatting dropped dangling comments between the string parts.

```python
result_f = (
    f'  File "{__file__}", line {lineno_f+1}, in f\n'
    '    f()\n'
    # XXX: The following line changes depending on whether the tests
    # are run through the interactive interpreter or with -m
    # It also varies depending on the platform (stack size)
    # Fortunately, we don't care about exactness here, so we use regex
    r'  \[Previous line repeated (\d+) more times\]' '\n'
    'RecursionError: maximum recursion depth exceeded\n'
)
```

The solution here isn't ideal because it re-introduces the `enclosing_parent` on `DecoratedComment` but it is the easiest fix that I could come up. 
I didn't spend more time finding another solution becaues I think we have to re-write most of the fstring formatting with the upcoming Python 3.12 support (because lexing the individual parts as we do now will no longer work).

closes #6440

<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan

`cargo test`

The child PR testing that all comments are formatted should now pass

crates/ruff_python_formatter/src/comments/placement.rs

@@ -73,6 +73,13 @@ pub(super) fn place_comment<'a>(
             handle_leading_class_with_decorators_comment(comment, class_def)
         }
         AnyNodeRef::StmtImportFrom(import_from) => handle_import_from_comment(comment, import_from),
+        AnyNodeRef::ExprConstant(_) => {
+            if let Some(AnyNodeRef::ExprFString(fstring)) = comment.enclosing_parent() {
+                CommentPlacement::dangling(fstring, comment)
+            } else {
+                CommentPlacement::Default(comment)
+            }
+        }
         AnyNodeRef::ExprList(_)
         | AnyNodeRef::ExprSet(_)
         | AnyNodeRef::ExprGeneratorExp(_)