[Unified checkpoint] update optimizer async save signal

[DesmonDay]

PR types

Bug fixes

PR changes

Others

Description

Update optimizer async save signal.

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 54.83%. Comparing base (d505a97) to head (5451d31).
Report is 218 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/trainer/trainer.py	0.00%	5 Missing ⚠️
paddlenlp/trainer/trainer_utils.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8975      +/-   ##
===========================================
+ Coverage    54.80%   54.83%   +0.03%     
===========================================
  Files          647      647              
  Lines       102474   102532      +58     
===========================================
+ Hits         56157    56228      +71     
+ Misses       46317    46304      -13     

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[wawltor]

LGTM