[ez] Delete torch25_custom_graph_pass (#33287)

Signed-off-by: angelayi <yiangela7@gmail.com>

vllm/compilation/torch25_custom_graph_pass.py

-# SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-from abc import ABC, abstractmethod
-from typing import Any, NoReturn
-
-import torch
-
-
-class Torch25CustomGraphPass(ABC):  # noqa (redefinition)
-    """
-    This class replaces CustomGraphPass from torch==2.6 when using torch<2.6.
-    It conforms to the 2.6 interface but also supports pickling, as that's what
-    the inductor code cache uses to determine the cache key before 2.6.
-    (in 2.6 and above, uuid() is used.)
-
-    Subclasses can just "pretend" that uuid is used.
-    """
-
-    @abstractmethod
-    def __call__(self, graph: torch.fx.graph.Graph) -> None:
-        """
-        Implementation of the custom pass.
-        """
-
-    @abstractmethod
-    def uuid(self) -> Any | None:
-        """
-        Return an ID to uniquely identify your custom pass implementation.
-        Return None to skip inductor code caching entirely.
-        """
-
-    def __getstate__(self) -> Any | None:
-        """
-        Pickling is used instead of uuid() in torch<2.6. Just return uuid()
-         to enable subclasses to only have to implement uuid.
-        """
-        return self.uuid()
-
-    def __setstate__(self, state: Any) -> NoReturn:
-        raise ValueError(
-            "Cannot unpickle CustomGraphPass because pickling"
-            " is used for cache key uuid. Use torch>=2.6 with"
-            " native uuid support for custom passes."
-        )