Port xpu for test_fx_experimental_xpu.py

[libohao1201]

No description provided.

[libohao1201]

@copilot https://gh.io/copilot-coding-agent-docs https://gh.io/copilot-coding-agent-docs The Python lint (flake8/ruff) check failed. Please fix the lint errors in this PR.

Important: Do NOT update the plan in the PR description directly. Use reply comments to update the status.

Lint job log: https://github.com/intel/torch-xpu-ops/actions/runs/27261084799

Instructions:

Review the lint failure log via the link above
Fix all lint errors in the relevant source files
Ensure both Python lint and Clang format checks pass
Use reply comments to report progress - do NOT modify the PR description plan directly

[Copilot]

@copilot https://gh.io/copilot-coding-agent-docs https://gh.io/copilot-coding-agent-docs The Python lint (flake8/ruff) check failed. Please fix the lint errors in this PR.

Important: Do NOT update...

Addressed in commit 15f3e88.

I inspected the failing run (27261084799) and applied the PYFMT-required fixes in test/xpu/test_fx_experimental_xpu.py (import ordering + formatting only). I then re-ran local lint checks with .github/scripts/lintrunner.sh for Python linters (--skip CLANGTIDY,CLANGFORMAT,MERGE_CONFLICTLESS_CSV --all-files) and they pass. Since this PR change is Python-only, no C++ formatting changes were introduced.