[CI] Temporarily avoid the issue DTS2608260106811 by disabling the MC2 feature switch. (#15126)

### What this PR does / why we need it?
Temporarily avoid the issue DTS2608260106811 by disabling the MC2
feature switch.

### Does this PR introduce _any_ user-facing change?
NO

### How was this patch tested?
run the cases nightly

- vLLM version: v0.27.1
- vLLM main:
https://github.com/vllm-project/vllm/commit/ba07e4a48fc951300d97eb506217dd530583dea3

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Signed-off-by: guxin108 <1252896542@qq.com>