Avoid unstable formatting in ellipsis-only body with trailing comment (#8984)

## Summary

We should avoid inlining the ellipsis in:

```python
def h():
    ...
    # bye
```

Just as we omit the ellipsis in:

```python
def h():
    # bye
    ...
```

Closes https://github.com/astral-sh/ruff/issues/8905.

crates/ruff_python_formatter/src/statement/suite.rs

@@ -511,7 +511,9 @@ pub(crate) fn contains_only_an_ellipsis(body: &[Stmt], comments: &Comments) -> b
             let [node] = body else {
                 return false;
             };
-            value.is_ellipsis_literal_expr() && !comments.has_leading(node)
+            value.is_ellipsis_literal_expr()
+                && !comments.has_leading(node)
+                && !comments.has_trailing_own_line(node)
         }
         _ => false,
     }