[CI] add sglang integration test

[Ann-1024]

Description

Type of Change

• Types
  • [ ] Bug fix
  • [ ] New feature
    • [ ] Transfer Engine
    • [ ] Mooncake Store
    • [ ] Mooncake EP
    • [ ] Integration
    • [ ] P2P Store
    • [ ] Python Wheel
  • [ ] Breaking change
  • [x] CI/CD
  • [ ] Documentation update
  • [ ] Other

How Has This Been Tested?

Checklist

• [x] I have performed a self-review of my own code.
• [ ] I have updated the documentation.
• [ ] I have added tests to prove my changes are effective.

[gemini-code-assist[bot]]

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