[Chore]: Reorganize gguf utils funtions under transformers_utils (#29891)

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>

tests/transformers_utils/test_utils.py

@@ -5,13 +5,15 @@ from unittest.mock import patch
 
 import pytest
 
+from vllm.transformers_utils.gguf_utils import (
+    is_gguf,
+    is_remote_gguf,
+    split_remote_gguf,
+)
 from vllm.transformers_utils.utils import (
     is_cloud_storage,
     is_gcs,
-    is_gguf,
-    is_remote_gguf,
     is_s3,
-    split_remote_gguf,
 )
 
 
@@ -132,7 +134,7 @@ class TestSplitRemoteGGUF:
 class TestIsGGUF:
     """Test is_gguf utility function."""
 
-    @patch("vllm.transformers_utils.utils.check_gguf_file", return_value=True)
+    @patch("vllm.transformers_utils.gguf_utils.check_gguf_file", return_value=True)
     def test_is_gguf_with_local_file(self, mock_check_gguf):
         """Test is_gguf with local GGUF file."""
         assert is_gguf("/path/to/model.gguf")
@@ -149,7 +151,7 @@ class TestIsGGUF:
         assert not is_gguf("repo/model:quant")
         assert not is_gguf("repo/model:INVALID")
 
-    @patch("vllm.transformers_utils.utils.check_gguf_file", return_value=False)
+    @patch("vllm.transformers_utils.gguf_utils.check_gguf_file", return_value=False)
     def test_is_gguf_false(self, mock_check_gguf):
         """Test is_gguf returns False for non-GGUF models."""
         assert not is_gguf("unsloth/Qwen3-0.6B")