Migrate old C++ unit tests to Python framework (#47006)

* softplus+activation

* fc + elementwise_add test refactored

* rename MKLDNN to OneDNN

* fc+activation tests refactored

* remove softplus ut

* whitespace

* whitespace

* codestyle

* codestyle

* add more cases to fc+act

* remove softplus+hard_sigmoid pass

* remove softplus + hard_sigmoid UT

* add approximate for gelu

* swish beta range

* new codestyle

* reduce number of tests

Author: Silv3S

paddle/fluid/framework/ir/CMakeLists.txt

@@ -399,13 +399,6 @@ if(WITH_MKLDNN)
     test_params_quantization_mkldnn_pass SRCS
     mkldnn/params_quantization_mkldnn_pass_tester.cc DEPS
     params_quantization_mkldnn_pass)
-  cc_test_old(
-    test_fc_elementwise_add_mkldnn_fuse_pass SRCS
-    mkldnn/fc_elementwise_add_mkldnn_fuse_pass_tester.cc DEPS
-    fc_elementwise_add_mkldnn_fuse_pass pass_test_util)
-  cc_test_old(
-    test_fc_act_mkldnn_fuse_pass SRCS mkldnn/fc_act_mkldnn_fuse_pass_tester.cc
-    DEPS fc_act_mkldnn_fuse_pass pass_test_util)
   cc_test_old(
     test_batch_norm_act_fuse_pass SRCS
     mkldnn/batch_norm_act_fuse_pass_tester.cc DEPS batch_norm_act_fuse_pass