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

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

tests/plugins_tests/test_platform_plugins.py

@@ -10,29 +10,38 @@ from vllm.plugins import load_general_plugins
 def test_platform_plugins():
     # simulate workload by running an example
     import runpy
+
     current_file = __file__
     import os
+
     example_file = os.path.join(
         os.path.dirname(os.path.dirname(os.path.dirname(current_file))),
-        "examples", "offline_inference/basic/basic.py")
+        "examples",
+        "offline_inference/basic/basic.py",
+    )
     runpy.run_path(example_file)
 
     # check if the plugin is loaded correctly
     from vllm.platforms import _init_trace, current_platform
+
     assert current_platform.device_name == "DummyDevice", (
         f"Expected DummyDevice, got {current_platform.device_name}, "
         "possibly because current_platform is imported before the plugin"
-        f" is loaded. The first import:\n{_init_trace}")
+        f" is loaded. The first import:\n{_init_trace}"
+    )
 
 
 def test_oot_custom_op(monkeypatch: pytest.MonkeyPatch):
     # simulate workload by running an example
     load_general_plugins()
     from vllm.model_executor.layers.rotary_embedding import RotaryEmbedding
+
     layer = RotaryEmbedding(16, 16, 16, 16, True, torch.float16)
     assert layer.__class__.__name__ == "DummyRotaryEmbedding", (
         f"Expected DummyRotaryEmbedding, got {layer.__class__.__name__}, "
-        "possibly because the custom op is not registered correctly.")
+        "possibly because the custom op is not registered correctly."
+    )
     assert hasattr(layer, "addition_config"), (
         "Expected DummyRotaryEmbedding to have an 'addition_config' attribute, "
-        "which is set by the custom op.")
+        "which is set by the custom op."
+    )