[ROCm] fix kernel explorer GemmSoftmaxGemm test (#16735)
GemmSoftmaxGemmTunble occasionally broken with large numerical error.
The root cause of this error is CK's Strided Batched Gemm has larger
error under a specific initialization distribution
`(multinormal_distribution)`.
Generic(Gemm1 + Softmax + Gemm2) implementation is one instance of
GemmSoftmaxGemmTunble. Gemm1 and Gemm2 in Generic implementation are
TunableOps when tuning enabled. In some case GemmSoftmaxGemmTunble
select Generic implentation, while Gemm1 or Gemm2 select ck
implementation, the result of GemmSoftmaxGemmTunble affect by CK.
- Make tolerance more loosen.
- Add `GemmSoftmaxGemmPermuteGenericNestedTunable` to test Generic
implementation with tuning enabled.
