fix: replace decommissioned kimi models with kimi-k2p5

[SunnySoldier357]

Summary

• Replace decommissioned kimi-k2-instruct-0905 and kimi-k2-thinking with kimi-k2p5 across all tests and quickstart configs — the old models are no longer deployed on serverless and return 404s
• Add "reasoning_effort": "none" to non-quality-sensitive test completion params to match the old instruct model's non-reasoning behavior
• Remove test_basic_coding and test_hallucination pytest tests and their datasets — these tested model quality, not SDK correctness, making them fragile CI gates

Test plan

• All CI shards should pass (Shard 1 was failing with score thresholds, Shard 2 was failing with 404s on kimi-k2-thinking)

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