remove refined recompute deep copy

[JunnYu]

PR types

Function optimization

PR changes

APIs

Description

删除refined recompute对config的deep copy操作。
添加对应的文档介绍。

[paddle-bot]

Thanks for your contribution!

[DesmonDay]

QwenBlock的外部调用，缺少了layer_idx的输入，可以检查一下。

[codecov]

Codecov Report

Attention: Patch coverage is 41.86047% with 25 lines in your changes missing coverage. Please review.

Project coverage is 52.80%. Comparing base (605a4ea) to head (927d157).
Report is 1 commits behind head on develop.

❗ Current head 927d157 differs from pull request most recent head 2878179

Please upload reports for the commit 2878179 to get more accurate results.

Files with missing lines	Patch %	Lines
paddlenlp/transformers/llama/modeling.py	38.46%	8 Missing ⚠️
paddlenlp/transformers/qwen/modeling.py	42.85%	8 Missing ⚠️
paddlenlp/transformers/qwen2/modeling.py	38.46%	8 Missing ⚠️
paddlenlp/transformers/refined_recompute.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9617      +/-   ##
===========================================
+ Coverage    52.77%   52.80%   +0.02%     
===========================================
  Files          718      718              
  Lines       112154   112225      +71     
===========================================
+ Hits         59193    59262      +69     
- Misses       52961    52963       +2     

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