[T5] add prepare_decoder_input_ids_from_labels method

[JunnYu]

PR types

New features

PR changes

Models

Description

Fix #4328

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Merging #4331 (65705b0) into develop (5cc4b21) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #4331   +/-   ##
========================================
  Coverage    36.30%   36.30%           
========================================
  Files          419      419           
  Lines        59222    59256   +34     
========================================
+ Hits         21498    21515   +17     
- Misses       37724    37741   +17     

Impacted Files	Coverage Δ
paddlenlp/transformers/t5/modeling.py	85.07% <100.00%> (-0.22%)	⬇️
paddlenlp/transformers/bart/modeling.py	84.16% <0.00%> (-1.15%)	⬇️
paddlenlp/transformers/mbart/modeling.py	80.73% <0.00%> (-1.03%)	⬇️
...lenlp/ops/fast_transformer/transformer/decoding.py	7.47% <0.00%> (-0.03%)	⬇️
paddlenlp/transformers/roberta/modeling.py	90.21% <0.00%> (+0.36%)	⬆️

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