[CI][KVConnector][Metrics] Update multi KV connector edge case according to prefill stats changes#39808

markmc merged 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

ZhanqiuHu:fix/multi-connector-metrics-assertionsZhanqiuHu/vllm:fix/multi-connector-metrics-assertionsCopy head branch name to clipboard