[Feature] Set overlap schedule as default

[Sunny-bot1]

Motivation

GPU下除MTP、PD分离、RL场景，默认开启overlap schedule，实现性能提升。

相关PR

1. exist_prefill，v1 scheduler下采用flag变量记录：[Model Runner] Add exist_prefill_flag #6172
   1. 修复PR：[BugFix] Fix exist_prefill_flag when preempted task exist #6629 [Cherry-Pick][BugFix] Fix exist_prefill_flag when preempted task exist (#6629) #6630
2. fa3前处理进CUDA graph：[Model Runner] Prepare token count and move FA3 initialization into the graph #6170
3. 拆分execute_model，not_need_stop、sampled_token_ids在 _postprocess 阶段异步拷贝，利用cuda event在save_output阶段进行同步：[Model Runner] Refactor execute_model for GPU async scheduling #6176
4. 实现event_loop_overlap，当连续处理decode batch时复用上一个 batch 的 token_num来进行 launch： [Model Runner] Support overlap schedule #6259
5. 支持logprob异步拷贝：[Optimization] Support logprob async copy #6362
6. 移除not_need_stop，解决insert_task_v1 decode分支引入的同步，解决TP空跑问题，进一步提升overlap schedule性能：[Model Runner] Deprecate not_need_stop #6356
   1. seq_lens_this_time 修复PR：[BugFix] Fix seq_lens_this_time init #6670
   2. EB5 runner 修复PR： [BugFix] Fix EB5 model runner compatibility check in worker process #6673

Modifications

1. GPU下除MTP、PD分离、RL场景，--enable-overlap-schedule 默认为True
2. topp_seed提前拷贝，消除同步
3. 适配 zmq（FD_USE_GET_SAVE_OUTPUT_V1）

TODO：

1. 修复PD分离下出现的输出变长&CUDA error
2. 适配MTP
3. RL场景验证

Usage or Command

关闭overlap schedule：--no-enable-overlap-schedule

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 73.33333% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@0c69cdf). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...executor/layers/sample/ops/top_k_top_p_sampling.py	57.14%	3 Missing ⚠️
fastdeploy/model_executor/pre_and_post_process.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #6668   +/-   ##
==========================================
  Coverage           ?   72.67%           
==========================================
  Files              ?      392           
  Lines              ?    53855           
  Branches           ?     8460           
==========================================
  Hits               ?    39137           
  Misses             ?    11932           
  Partials           ?     2786           

Flag	Coverage Δ
GPU	72.67% <73.33%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[EmmonsCurse]

LGTM～ Skip coverage check as it mainly relies on end-to-end tests.