Bump torch version to 2.7.1 (#1562)

### What this PR does / why we need it?
Bump torch version to 2.7.1, and cleanup infer schema patch
https://github.com/vllm-project/vllm-ascend/commit/857f489
(https://github.com/vllm-project/vllm-ascend/pull/837), this patch
depends on also: https://github.com/vllm-project/vllm-ascend/pull/1974

### Does this PR introduce any user-facing change?
No

#### How was this patch tested?
CI passed

torch-npu 2.7.1rc1 install guide:
https://gitee.com/ascend/pytorch/tree/v2.7.1/
install depending:
```
pip3 install pyyaml
pip3 install setuptools
```
install torch-npu:

Closes: https://github.com/vllm-project/vllm-ascend/issues/1866
Closes: https://github.com/vllm-project/vllm-ascend/issues/1390


- vLLM version: v0.10.0
- vLLM main:
9af654cc38

---------

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
Signed-off-by: leo-pony <nengjunma@outlook.com>
Co-authored-by: Yikun Jiang <yikunkero@gmail.com>

tests/ut/test_platform.py

@@ -543,13 +543,9 @@ class TestNPUPlatform(TestBase):
 
     @patch("torch.distributed.is_hccl_available", return_value=True)
     @patch("torch_npu._C._distributed_c10d.ProcessGroupHCCL")
-    @patch("torch_npu._C._distributed_c10d.ProcessGroupHCCL.Options")
     @patch("torch.distributed.ProcessGroup")
-    def test_successful_initialization(self, mock_pg, mock_options_cls,
-                                       mock_pg_hccl, _):
+    def test_successful_initialization(self, mock_pg, mock_pg_hccl, _):
         mock_prefix = MagicMock(spec=PrefixStore)
-        mock_options = MagicMock(spec=ProcessGroup.Options)
-        mock_options_cls.return_value = mock_options
         mock_backend = MagicMock()
         mock_pg_hccl.return_value = mock_backend
         group_rank = 0
@@ -574,8 +570,7 @@ class TestNPUPlatform(TestBase):
             timeout=timedelta(seconds=30),
         )
 
-        mock_pg.assert_called_once_with(mock_prefix, group_rank, group_size,
-                                        unittest.mock.ANY)
+        mock_pg.assert_called_once_with(mock_prefix, group_rank, group_size)
         mock_pg_hccl.assert_called_once_with(mock_prefix, group_rank,
                                              group_size, unittest.mock.ANY)
         mock_backend._set_sequence_number_for_group.assert_called_once()