Fix score payload typo and add regression test

[keyuchen21]

• Correct the score model test payload to use text_2 instead of the misspelled test_2.
• Add a unit test to ensure the score payload contains the expected fields/values.
• Keeps /v1/score health checks and sample calls aligned with the helper.

[gemini-code-assist]

Summary of Changes

Hello @keyuchen21, 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 focuses on improving the robustness and correctness of the score model's test payload. It rectifies a minor but impactful typo in the payload's key and introduces a dedicated regression test to validate the payload's structure and content, thereby preventing future inconsistencies and ensuring that health checks and sample calls remain aligned.

Highlights

• Typo Correction: Corrected a typo in the score model's test payload within src/vllm_router/utils.py, changing the key from test_2 to text_2 to align with expected field names.
• Regression Test: Added a new unit test, test_get_test_payload_score_contains_required_fields, in src/tests/test_utils.py to ensure the score model's test payload consistently contains the correct fields (text_1 and text_2) and their expected values.

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[gemini-code-assist]

Code Review

This pull request corrects a typo in the test payload for the score model type and adds a new unit test to prevent regressions. The changes are correct and address the issue. I've provided one suggestion to make the new test more comprehensive by verifying all fields in the payload, which will improve its robustness.