Formatter: Improve single-with item formatting for Python 3.8 or older (#10276)

## Summary

This PR changes how we format `with` statements with a single with item
for Python 3.8 or older. This change is not compatible with Black.

This is how we format a single-item with statement today 

```python
def run(data_path, model_uri):
    with pyspark.sql.SparkSession.builder.config(
        key="spark.python.worker.reuse", value=True
    ).config(key="spark.ui.enabled", value=False).master(
        "local-cluster[2, 1, 1024]"
    ).getOrCreate():
        # ignore spark log output
        spark.sparkContext.setLogLevel("OFF")
        print(score_model(spark, data_path, model_uri))
```

This is different than how we would format the same expression if it is
inside any other clause header (`while`, `if`, ...):

```python
def run(data_path, model_uri):
    while (
        pyspark.sql.SparkSession.builder.config(
            key="spark.python.worker.reuse", value=True
        )
        .config(key="spark.ui.enabled", value=False)
        .master("local-cluster[2, 1, 1024]")
        .getOrCreate()
    ):
        # ignore spark log output
        spark.sparkContext.setLogLevel("OFF")
        print(score_model(spark, data_path, model_uri))

```

Which seems inconsistent to me. 

This PR changes the formatting of the single-item with Python 3.8 or
older to match that of other clause headers.

```python
def run(data_path, model_uri):
    with (
        pyspark.sql.SparkSession.builder.config(
            key="spark.python.worker.reuse", value=True
        )
        .config(key="spark.ui.enabled", value=False)
        .master("local-cluster[2, 1, 1024]")
        .getOrCreate()
    ):
        # ignore spark log output
        spark.sparkContext.setLogLevel("OFF")
        print(score_model(spark, data_path, model_uri))
```

According to our versioning policy, this style change is gated behind a
preview flag.

## Test Plan

See added tests.

Added

crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/with.py

@@ -318,3 +318,13 @@ with (
     )
 ):
     pass
+
+with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb:
+    pass
+
+with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
+    pass
+
+if True:
+    with anyio.CancelScope(shield=True) if get_running_loop() else contextlib.nullcontext() as b:
+        pass