[CI] Revise the test case configurations for Kimi-K2.6 to accommodate long-sequence scenarios (#15226)

### What this PR does / why we need it?
Revise the test case configurations for Kimi-K2.6 to accommodate
long-sequence scenarios

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

### How was this patch tested?
Tested via the weekly multi-node CI pipeline with the updated
configuration files.

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

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Signed-off-by: weixin <murongfengerxch@163.com>