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

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

tests/test_regression.py

@@ -6,6 +6,7 @@ It should include tests that are reported by users and making sure they
 will never happen again.
 
 """
+
 import gc
 
 import pytest
@@ -18,12 +19,12 @@ from vllm import LLM, SamplingParams
 def test_duplicated_ignored_sequence_group():
     """https://github.com/vllm-project/vllm/issues/1655"""
 
-    sampling_params = SamplingParams(temperature=0.01,
-                                     top_p=0.1,
-                                     max_tokens=256)
-    llm = LLM(model="distilbert/distilgpt2",
-              max_num_batched_tokens=4096,
-              tensor_parallel_size=1)
+    sampling_params = SamplingParams(temperature=0.01, top_p=0.1, max_tokens=256)
+    llm = LLM(
+        model="distilbert/distilgpt2",
+        max_num_batched_tokens=4096,
+        tensor_parallel_size=1,
+    )
     prompts = ["This is a short prompt", "This is a very long prompt " * 1000]
     outputs = llm.generate(prompts, sampling_params=sampling_params)
 
@@ -31,12 +32,12 @@ def test_duplicated_ignored_sequence_group():
 
 
 def test_max_tokens_none():
-    sampling_params = SamplingParams(temperature=0.01,
-                                     top_p=0.1,
-                                     max_tokens=None)
-    llm = LLM(model="distilbert/distilgpt2",
-              max_num_batched_tokens=4096,
-              tensor_parallel_size=1)
+    sampling_params = SamplingParams(temperature=0.01, top_p=0.1, max_tokens=None)
+    llm = LLM(
+        model="distilbert/distilgpt2",
+        max_num_batched_tokens=4096,
+        tensor_parallel_size=1,
+    )
     prompts = ["Just say hello!"]
     outputs = llm.generate(prompts, sampling_params=sampling_params)