[Bugfix] Revert host-side ACL graph parameter updates from #1…

[shiqiangA]

…6798

This reverts commit 34bb51f.

Restore FIA and speculative-decoding graph replay to the pre-UpdatableGraph path. Keep later unrelated changes already present on the branch, including attention_transfer_window from #16747 and the vLLM 0.29.0 PCP import from #17004.

What this PR does / why we need it?

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM main: vllm-project/vllm@84030bb

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[shiqiangA]

/nightly qwen3-30b-a3b-w8a8-a2-performance
nightly command triggered.

• Nightly-A2: workflow run

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request reverts the UpdatableGraph implementation, returning the system to the previous, more stable path for FIA and speculative-decoding graph replay. It maintains subsequent unrelated improvements while cleaning up the codebase by removing the deprecated UpdatableGraph class and its dependencies.

Highlights

• Revert UpdatableGraph: Reverted the host-side ACL graph parameter updates introduced in [Feature][MRV1][MRV2] Refactor Host-Side Parameter Updates for ACL Graph Replay. #16798, effectively removing the UpdatableGraph implementation.
• Restore Graph Replay Path: Restored FIA and speculative-decoding graph replay to the pre-UpdatableGraph path to ensure stability.
• Codebase Cleanup: Removed the UpdatableGraph class and all associated dependencies, helper methods, and test mocks across the repository.

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[shiqiangA]

/nightly Qwen3-235B-disagg-pd
nightly command triggered.

[gemini-code-assist]

Code Review

Suggested PR Title:

[Attention][Misc] Refactor attention graph replay to remove UpdatableGraph and use standard NPUGraph

Suggested PR Summary:

### What this PR does / why we need it?
This PR refactors the attention graph replay mechanism by completely removing the custom `UpdatableGraph` implementation and replacing it with PyTorch's standard `torch.npu.NPUGraph`. The graph parameter update logic for both Paged Attention and Fused Infer Attention (FIA) has been consolidated directly into `AscendAttentionBackendImpl.update_graph_params`. This simplifies the codebase, removes redundant metadata update paths in speculative decoding proposers, and cleans up the `weak_ref_tensors` utility.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Tested with existing and updated unit tests in `tests/ut/attention/test_attention_v1.py` and `tests/ut/compilation/test_acl_graph.py`.

I have no further feedback to provide as there are no review comments.

[shiqiangA]

/nightly Qwen3-235B-disagg-pd
nightly command triggered.

[czydyy]

/nightly Qwen3-235B-disagg-pd
nightly command triggered.

[czydyy]

/nightly multi-node-qwen-disagg-pd
nightly command triggered.

• Nightly-A3: workflow run