[Feat] allow using aclgraph in ray backend

[WithHades]

What this PR does / why we need it?

Allow using aclgraph in ray backend, for tp + pp + aclgraph in multi machine

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.10.1.1
• vLLM main: vllm-project/vllm@4ba0c58

[gemini-code-assist]

Code Review

This pull request enables the use of ACL Graph with the Ray distributed executor backend by removing the check that previously disabled it. While this is a valuable feature enablement, the corresponding unit test that verifies the old behavior has not been updated, which will cause the test suite to fail. Please address the failing test to ensure the change is properly validated.

[github-actions]

👋 Hi! Thank you for contributing to the vLLM Ascend project. The following points will speed up your PR merge:‌‌

• A PR should do only one thing, smaller PRs enable faster reviews.
• Every PR should include unit tests and end-to-end tests ‌to ensure it works and is not broken by other future PRs.
• Write the commit message by fulfilling the PR description to help reviewer and future developers understand.

If CI fails, you can run linting and testing checks locally according Contributing and Testing.

[Yikun]

is it possible to add a e2e test for ray+aclgraph.

@yiz-liu @MengqingCao Please take a look on this, thanks.

[MengqingCao]

is it possible to add a e2e test for ray+aclgraph.

@yiz-liu @MengqingCao Please take a look on this, thanks.

the test of ray+aclgraph on single node will be added naturally when the refactor of CI is done, plz refer to https://github.com/vllm-project/vllm-ascend/pull/2276/files#diff-19912dc7bc00e91104289260c0d7127e6e320a91cbf36dba23966beb800d4f9eL45

And to cover the previous failed scenario, we'll add a e2e test for ray + aclgraph + multi-node when the multi-node CI is ready

[MengqingCao]

plz remove the failed ut, as it check if compilation level and cudagraph_mode is set correctly when enabling ray
https://github.com/vllm-project/vllm-ascend/actions/runs/17286060253/job/49063686288?pr=2589

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.73%. Comparing base (24d4dad) to head (a79245e).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2589      +/-   ##
==========================================
- Coverage   73.71%   72.73%   -0.99%     
==========================================
  Files         152      150       -2     
  Lines       21967    21483     -484     
==========================================
- Hits        16194    15625     -569     
- Misses       5773     5858      +85     

Flag	Coverage Δ
unittests	72.73% <ø> (-0.99%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[yiz-liu]

Same here like #2472 , rebase main and signoff. @WithHades

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.