support_lastnorm_gather_split_r2.4

[xiaoluomi]

Motivation

开启SP时，LLM主模型的last norm和gather过程耦合在一起，不便于多步投机解码调用。故将此特殊的norm和gather进行解耦。

Modifications

修改各个moe模型的组网，在组网中将其解耦。

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 15.78947% with 16 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/2.4@44e44ab). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/model_executor/models/gpt_oss.py	0.00%	4 Missing ⚠️
fastdeploy/model_executor/models/deepseek_v3.py	0.00%	1 Missing and 1 partial ⚠️
fastdeploy/model_executor/models/ernie4_5_moe.py	0.00%	1 Missing and 1 partial ⚠️
fastdeploy/model_executor/models/ernie4_5_mtp.py	50.00%	1 Missing and 1 partial ⚠️
...del_executor/models/ernie4_5_vl/ernie4_5_vl_moe.py	0.00%	1 Missing and 1 partial ⚠️
fastdeploy/model_executor/models/glm4_moe.py	0.00%	1 Missing and 1 partial ⚠️
fastdeploy/model_executor/models/qwen3moe.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             release/2.4    #5925   +/-   ##
==============================================
  Coverage               ?   58.80%           
==============================================
  Files                  ?      329           
  Lines                  ?    40848           
  Branches               ?     6227           
==============================================
  Hits                   ?    24019           
  Misses                 ?    14951           
  Partials               ?     1878           

Flag	Coverage Δ
GPU	58.80% <15.78%> (?)

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