[Fix] Fix eplb for ep mixed

[xiaoxiaohehe001]

Motivation

基于 #4786 pr 进行 eplb 相关代码适配的完善，其中包括：

• 发起重排后负载统计shape校验报错
• 离线 fp8 dtype 兼容
• 集中式 eplb 适配

Modifications

Usage or Command

Accuracy Tests

Checklist

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• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
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[paddle-bot]

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