[CI]Delete failure analyze job

[Xuyzhen]

What this PR does / why we need it?

Gray‑scale testing for the precision test project has been completed. The failure‑analysis script is no longer required, and redundant features are removed.

Does this PR introduce any user-facing change?

N/A

How was this patch tested?

• vLLM version: v0.27.1
• vLLM main: vllm-project/vllm@58d3918

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[github-actions]

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