Convert benchmarks to ruff format (#18068)

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

pyproject.toml

@@ -54,6 +54,7 @@ include = ["vllm*"]
 [tool.yapfignore]
 ignore_patterns = [
     ".buildkite/**",
+    "benchmarks/**",
     "build/**",
 ]
 
@@ -155,6 +156,10 @@ ignore-words-list = "dout, te, indicies, subtile, ElementE"
 skip = "tests/models/fixtures/*,tests/prompts/*,benchmarks/sonnet.txt,tests/lora/data/*,build/*,vllm/third_party/*"
 
 [tool.isort]
+skip_glob = [
+    ".buildkite/*",
+    "benchmarks/*",
+]
 use_parentheses = true
 skip_gitignore = true