Remove all references to yapf as it's no longer used (#26251)

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

vllm/entrypoints/chat_utils.py

@@ -17,9 +17,6 @@ import jinja2.nodes
 import jinja2.parser
 import jinja2.sandbox
 import transformers.utils.chat_template_utils as hf_chat_utils
-
-# yapf conflicts with isort for this block
-# yapf: disable
 from openai.types.chat import (
     ChatCompletionAssistantMessageParam,
     ChatCompletionContentPartImageParam,
@@ -40,8 +37,6 @@ from openai.types.responses import ResponseInputImageParam
 from openai_harmony import Message as OpenAIHarmonyMessage
 from PIL import Image
 from pydantic import BaseModel, ConfigDict, TypeAdapter
-
-# yapf: enable
 from transformers import PreTrainedTokenizer, PreTrainedTokenizerFast, ProcessorMixin
 
 # pydantic needs the TypedDict from typing_extensions
@@ -52,11 +47,7 @@ from vllm.logger import init_logger
 from vllm.model_executor.models import SupportsMultiModal
 from vllm.multimodal import MULTIMODAL_REGISTRY, MultiModalDataDict, MultiModalUUIDDict
 from vllm.multimodal.utils import MediaConnector
-
-# yapf: disable
 from vllm.transformers_utils.chat_templates import get_chat_template_fallback_path
-
-# yapf: enable
 from vllm.transformers_utils.processor import cached_get_processor
 from vllm.transformers_utils.tokenizer import AnyTokenizer, MistralTokenizer
 from vllm.utils import random_uuid, supports_kw
@@ -317,11 +308,7 @@ def _is_var_or_elems_access(
     ):
         return _is_var_or_elems_access(node.node, varname, key)
 
-    # yapf: disable
-    return (
-        _is_attr_access(node, varname, key) if key
-        else _is_var_access(node, varname)
-    ) # yapf: enable
+    return _is_attr_access(node, varname, key) if key else _is_var_access(node, varname)
 
 
 def _iter_nodes_assign_var_or_elems(root: jinja2.nodes.Node, varname: str):