test: Replace hardcoded CUDA device with get_device() for XPU support

[kalyank007]

test: Replace hardcoded CUDA device with get_device() for XPU support

Removed hardcoded "cuda" device references in test/srt/models and replaced them with get_device() calls to support XPU and other devices.

[gemini-code-assist]

Summary of Changes

Hello @kalyank007, 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 modernizes the test infrastructure by abstracting device-specific calls. By replacing direct references to "cuda" with a utility function, the tests can now seamlessly adapt to different hardware platforms, such as XPU, without requiring manual code changes. This significantly enhances the portability and future-proofing of the test suite.

Highlights

• Device Agnostic Testing: Replaced hardcoded "cuda" device references in test runners with get_device() calls.
• Enhanced Device Support: This change enables the test suite to run on various devices, including XPU, improving flexibility and broader hardware compatibility.
• Code Modernization: Standardized device assignment within test utilities by leveraging a common get_device() function.

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[gemini-code-assist]

Code Review

This pull request effectively replaces hardcoded "cuda" device references with get_device() calls in python/sglang/test/runners.py. The changes are consistent and correctly implemented, making the test runners more device-agnostic and enabling support for devices like XPU. The refactoring is clean and well-scoped. I have reviewed the changes and found no issues.