[BugFix] fix eb5 prefix bug

[kevincheng2]

Motivation

💡 If this PR is a Cherry Pick, the PR title needs to follow the format by adding the [Cherry-Pick] label at the very beginning and appending the original PR ID at the end. For example, [Cherry-Pick][CI] Add check trigger and logic(#5191)

💡 如若此PR是Cherry Pick，PR标题需遵循格式，在最开始加上[Cherry-Pick]标签，以及最后面加上原PR ID，例如[Cherry-Pick][CI] Add check trigger and logic(#5191)

当上下文缓存完全命中时，会revert 一个block的token，保证输入非空。但在 eb5 多模场景下，会导致输入缺少多模信息

Modifications

1. eb5 多模场景完全命中时，提前revert 掉一个block的token，再去执行 revert_chunked_mm_input，避免命中部分图片
2. 将 prefix_cache_manager.py 中的 revert 逻辑移动到 resource_manager_v1.py 中，减少和匹配逻辑的耦合

Usage or Command

Accuracy Tests

Checklist

• Add at least a tag in the PR title.
  • 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]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 10 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@7ad5737). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/engine/sched/resource_manager_v1.py	50.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #5879   +/-   ##
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  Coverage           ?   66.63%           
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  Files              ?      347           
  Lines              ?    44421           
  Branches           ?     6825           
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  Hits               ?    29599           
  Misses             ?    12640           
  Partials           ?     2182           

Flag	Coverage Δ
GPU	66.63% <50.00%> (?)

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[rainyfly]

如果是从前缀树里把这个 node 给摘除，是否需要加一个 从node.parent的孩子节点里移除

[kevincheng2]

如果是从前缀树里把这个 node 给摘除，是否需要加一个 从node.parent的孩子节点里移除

建树的时候，增加了判断是否已存在相同hash的block，如果有：保留旧block，跳过创建新block