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/tests/snapshots/format@statement__with.py.snap

@@ -324,6 +324,16 @@ 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
 ```
 
 ## Outputs
@@ -688,6 +698,121 @@ with open(
     "/etc/hosts"  # This is an incredibly long comment that has been replaced for sanitization
 ):
     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
+```
+
+
+#### Preview changes
+```diff
+--- Stable
++++ Preview
+@@ -49,7 +49,9 @@
+ with a:  # should remove brackets
+     pass
+ 
+-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as c:
++with (
++    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
++) as c:
+     pass
+ 
+ 
+@@ -214,7 +216,9 @@
+     pass
+ 
+ # Breaking of with items.
+-with test as (  # bar  # foo
++with (
++    test  # bar
++) as (  # foo
+     # test
+     foo
+ ):
+@@ -226,7 +230,9 @@
+ ):
+     pass
+ 
+-with test as (  # bar  # foo  # baz
++with (
++    test  # bar
++) as (  # foo  # baz
+     # test
+     foo
+ ):
+@@ -279,7 +285,9 @@
+ ) as b:
+     pass
+ 
+-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
++with (
++    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
++) as b:
+     pass
+ 
+ with (
+@@ -322,15 +330,19 @@
+         pass
+ 
+ if True:
+-    with anyio.CancelScope(
+-        shield=True
+-    ) if get_running_loop() else contextlib.nullcontext():
++    with (
++        anyio.CancelScope(shield=True)
++        if get_running_loop()
++        else contextlib.nullcontext()
++    ):
+         pass
+ 
+ if True:
+-    with anyio.CancelScope(
+-        shield=True
+-    ) if get_running_loop() else contextlib.nullcontext() as c:
++    with (
++        anyio.CancelScope(shield=True)
++        if get_running_loop()
++        else contextlib.nullcontext()
++    ) as c:
+         pass
+ 
+ with Child(aaaaaaaaa, bbbbbbbbbbbbbbb, cccccc), Document(
+@@ -344,14 +356,20 @@
+ ):
+     pass
+ 
+-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb:
++with (
++    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
++):
+     pass
+ 
+-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
++with (
++    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
++) as b:
+     pass
+ 
+ if True:
+-    with anyio.CancelScope(
+-        shield=True
+-    ) if get_running_loop() else contextlib.nullcontext() as b:
++    with (
++        anyio.CancelScope(shield=True)
++        if get_running_loop()
++        else contextlib.nullcontext()
++    ) as b:
+         pass
 ```
 
 
@@ -1093,4 +1218,23 @@ with open(
     "/etc/hosts"  # This is an incredibly long comment that has been replaced for sanitization
 ):
     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
 ```