[CI] Delete deepseek3.2-exp nightly test

[zhangxinyuehfad]

What this PR does / why we need it?

Delete deepseek3.2-exp nightly test firstly for replacing deepseek3.2-exp with deepseek3.2 after nightly tests pass.

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.12.0
• vLLM main: vllm-project/vllm@ad32e3e

[github-actions]

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