[Unified Checkpoint] Fix multi-node output share-folder

[DesmonDay]

PR types

Bug fixes

PR changes

Others

Description

Fix multi-node output share folder situation.

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (8d6e813) 56.58% compared to head (30af4fc) 56.57%.
Report is 3 commits behind head on develop.

Files	Patch %	Lines
paddlenlp/trainer/plugins/unified_checkpoint.py	0.00%	12 Missing ⚠️
paddlenlp/trainer/training_args.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7977      +/-   ##
===========================================
- Coverage    56.58%   56.57%   -0.01%     
===========================================
  Files          589      589              
  Lines        89904    89913       +9     
===========================================
+ Hits         50871    50872       +1     
- Misses       39033    39041       +8     

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