Convert formatting to use ruff instead of yapf + isort (#26247)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/distributed/test_pipeline_partition.py

@@ -9,7 +9,6 @@ from vllm.distributed.utils import get_pp_indices
 
 
 def test_custom_layer_partition(monkeypatch: pytest.MonkeyPatch):
-
     with monkeypatch.context() as m:
 
         def _verify(partition_str, num_layers, pp_size, goldens):
@@ -57,7 +56,8 @@ def test_custom_layer_partition(monkeypatch: pytest.MonkeyPatch):
         (5, 3, 0, (0, 2)),
         (5, 3, 1, (2, 4)),
         (5, 3, 2, (4, 5)),
-    ])
+    ],
+)
 def test_uneven_auto_partition(
     num_hidden_layers: int,
     pp_size: int,