[Distributed Dataloader] change process new_group creation

[DesmonDay]

PR types

Bug fixes

PR changes

Others

Description

由于多次创建dataloader时会出现多次创建通信组，造成显存泄露，因此修改到只统一调用一个global通信组。

[paddle-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 21.73913% with 18 lines in your changes missing coverage. Please review.

Project coverage is 52.93%. Comparing base (81a2d43) to head (8a1ef2b).

Files with missing lines	Patch %	Lines
paddlenlp/data/dist_dataloader.py	9.09%	10 Missing ⚠️
paddlenlp/trainer/trainer.py	33.33%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9438      +/-   ##
===========================================
- Coverage    52.96%   52.93%   -0.04%     
===========================================
  Files          681      676       -5     
  Lines       108066   107920     -146     
===========================================
- Hits         57238    57126     -112     
+ Misses       50828    50794      -34     

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