Only omit optinal parens if the expression ends or starts with a parenthesized expression

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## Summary

This PR matches Black' behavior where it only omits the optional parentheses if the expression starts or ends with a parenthesized expression:

```python
a + [aaa, bbb, cccc] * c # Don't omit
[aaa, bbb, cccc] + a * c # Split
a + c * [aaa, bbb, ccc] # Split 
```

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

## Test Plan

This improves the Jaccard index from 0.945 to 0.946

crates/ruff_python_formatter/src/lib.rs

@@ -280,8 +280,15 @@ if True:
     #[test]
     fn quick_test() {
         let src = r#"
-def foo() -> tuple[int, int, int,]:
-    return 2
+if a * [
+    bbbbbbbbbbbbbbbbbbbbbb,
+    cccccccccccccccccccccccccccccdddddddddddddddddddddddddd,
+] + a * e * [
+    ffff,
+    gggg,
+    hhhhhhhhhhhhhh,
+] * c:
+    pass
 
 "#;
         // Tokenize once