onnxruntime

Disable gemm activation for non-float data types (#19612)

### Description
Disable gemm activation for non-float data types


### Motivation and Context
When a float16 model contains a Gemm+Relu subgraph, the
gemm_activation_fusion will kick in and cause the two nodes to be
eliminated and replaced with a FusedGemm. This however is only
registered for the float data type. This causes model load failures.

Disable the fusion for non-float data types.

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Co-authored-by: Sheil Kumar <sheilk@microsoft.com>