[Accuracy diff No.43-44] Fix accuracy diff for paddle.grid_sample API

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PR Category

Operator Mechanism

PR Types

Bug fixes

Description

Torch 在 GPU 的 nearest mode 下，使用的 nearbyint 来获取最近的坐标，同步此修改，PaddleAPITest 测试通过

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Codecov Report

Attention: Patch coverage is 13.33333% with 13 lines in your changes missing coverage. Please review.

Please upload report for BASE (develop@c1efeb8). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
paddle/phi/kernels/cpu/grid_sample_grad_kernel.cc	0.00%	10 Missing ⚠️
paddle/phi/kernels/cpu/grid_sample_utils.h	40.00%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (13.33%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #74204   +/-   ##
==========================================
  Coverage           ?   13.33%           
==========================================
  Files              ?        2           
  Lines              ?       15           
  Branches           ?        0           
==========================================
  Hits               ?        2           
  Misses             ?       13           
  Partials           ?        0           

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