Created by: lidanqing-intel

MKL-DNN related ops UT states.

After the PR19011 is merged, the states will be

In which,

1. the group conv transpose in conv_tranpose_mkldnn_op.cc should be removed because it is not used in any models

2. in_place should be removed in sum_mkldnn_op.cc because this op is not registered and never used too. (Above 2 clean-ups I need to confirm with @wojtuss He is on vocation now.)

3. mul_mkldnn_op.cc is hard to cover more because of virtual functions. Improvements should be done first in mul_mkldnn_op.cc and then UT will follow.

4. In elementwise_mul_mkldnn_op.cc, the condition if (is_x_format_correct && is_y_format_correct && are_dims_divisable && is_avx512_enabled) will meet when MKLDNN choose the format by itself, which means one more op like conv should appear before elementwise_mul_mkldnn_op.cc then this condition will be met. I am working on this now.