fix(test): fix executor test on gpu

[TianyiZhao1437]

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💡 Description

Fix executor test on GPU sglang backend

Key Changes

1. Add default nccl port.
2. Ignore parallel state already set error.

🔗 Related Issues

List any issues this PR closes or relates to:

• Closes [Bug]: unit test failed on gpu #230

✅ Checklist

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• I have performed a self-review of my own code.
• I have added/updated tests that prove my fix or feature works (if applicable).
• I have updated the documentation (if necessary).
• My code follows the project's style guidelines.