[tmva][sofie] Add GELU activation operator #20788
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This PR adds support for the GELU activation function in TMVA::Experimental::SOFIE.
The implementation follows the ONNX-specified tanh-based approximation of GELU and
integrates with the existing SOFIE operator and ONNX parser infrastructure.
Changes include:
The implementation mirrors the existing Relu operator pattern and was validated by
building ROOT with TMVA and SOFIE enabled.