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

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

vllm/plugins/__init__.py

@@ -8,7 +8,7 @@ import vllm.envs as envs
 
 logger = logging.getLogger(__name__)
 
-DEFAULT_PLUGINS_GROUP = 'vllm.general_plugins'
+DEFAULT_PLUGINS_GROUP = "vllm.general_plugins"
 
 # make sure one process only loads plugins once
 plugins_loaded = False
@@ -16,6 +16,7 @@ plugins_loaded = False
 
 def load_plugins_by_group(group: str) -> dict[str, Callable[[], Any]]:
     import sys
+
     if sys.version_info < (3, 10):
         from importlib_metadata import entry_points
     else:
@@ -29,7 +30,7 @@ def load_plugins_by_group(group: str) -> dict[str, Callable[[], Any]]:
         return {}
 
     # Check if the only discovered plugin is the default one
-    is_default_group = (group == DEFAULT_PLUGINS_GROUP)
+    is_default_group = group == DEFAULT_PLUGINS_GROUP
     # Use INFO for non-default groups and DEBUG for the default group
     log_level = logger.debug if is_default_group else logger.info
 
@@ -38,8 +39,10 @@ def load_plugins_by_group(group: str) -> dict[str, Callable[[], Any]]:
         log_level("- %s -> %s", plugin.name, plugin.value)
 
     if allowed_plugins is None:
-        log_level("All plugins in this group will be loaded. "
-                  "Set `VLLM_PLUGINS` to control which plugins to load.")
+        log_level(
+            "All plugins in this group will be loaded. "
+            "Set `VLLM_PLUGINS` to control which plugins to load."
+        )
 
     plugins = dict[str, Callable[[], Any]]()
     for plugin in discovered_plugins: