[Precision Depth Alignment] fix beta and threshold of Softplus to double

[zhengshengning]

PR Category

Operator Mechanism

PR Types

New features

Description

PR #75363 中遗留了doule类型未能与torch对齐。
本Pr主要将beta和threshold两个参数的类型从float改为double，这样就可以完全与torch的精度对齐。

pcard-93269

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.35802% with 7 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@d4c0773). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
paddle/phi/kernels/onednn/softplus_kernel.cc	0.00%	3 Missing ⚠️
...addle/fluid/ir_adaptor/translator/op_translator.cc	93.33%	2 Missing ⚠️
paddle/phi/kernels/funcs/activation_functor.h	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #75698   +/-   ##
==========================================
  Coverage           ?   91.35%           
==========================================
  Files              ?       11           
  Lines              ?       81           
  Branches           ?        0           
==========================================
  Hits               ?       74           
  Misses             ?        7           
  Partials           ?        0           

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