Respect parentheses for precedence in await (#7468)

## Summary

We were using `Parenthesize::IfBreaks` universally for `await`, but
dropping parentheses can change the AST due to precedence. It turns out
that Black's rules aren't _exactly_ the same as operator precedence
(e.g., they leave parentheses around `await ([1, 2, 3])`, although they
aren't strictly required).

Closes https://github.com/astral-sh/ruff/issues/7467.

## Test Plan

`cargo test`

No change in similarity.

Before:

| project | similarity index | total files | changed files |

|--------------|------------------:|------------------:|------------------:|
| cpython | 0.76083 | 1789 | 1632 |
| django | 0.99982 | 2760 | 37 |
| transformers | 0.99957 | 2587 | 398 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99983 | 3496 | 18 |
| warehouse | 0.99929 | 648 | 16 |
| zulip | 0.99962 | 1437 | 22 |

After:

| project | similarity index | total files | changed files |

|--------------|------------------:|------------------:|------------------:|
| cpython | 0.76083 | 1789 | 1632 |
| django | 0.99982 | 2760 | 37 |
| transformers | 0.99957 | 2587 | 398 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99983 | 3496 | 18 |
| warehouse | 0.99929 | 648 | 16 |
| zulip | 0.99962 | 1437 | 22 |

crates/ruff_python_formatter/README.md

@@ -305,3 +305,21 @@ import os
 
 import sys
 ```
+
+### Parentheses around awaited collections are not preserved
+
+Black preserves parentheses around awaited collections:
+
+```python
+await ([1, 2, 3])
+```
+
+Ruff will instead remove them:
+
+```python
+await [1, 2, 3]
+```
+
+This is more consistent to the formatting of other awaited expressions: Ruff and Black both
+remove parentheses around, e.g., `await (1)`, only retaining them when syntactically required,
+as in, e.g., `await (x := 1)`.