[CI][XPU] Add XPU chunked_prefill && prefix_caching case

[plusNew001]

Motivation

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  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
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Pull Request Overview

This PR adds XPU testing coverage for chunked prefill and prefix caching features by enabling these flags in CI test scenarios.

• Enables --enable-prefix-caching and --enable-chunked-prefill for the V1 model test (ERNIE-4.5-300B with wint4 quantization)
• Enables --enable-chunked-prefill for the VL model test (ERNIE-4.5-VL-28B with wint8 quantization)