[JS/WebGPU] Added Uniforms to SkipLayerNorm. (#18788)
### Description
Added Uniforms to SkipLayerNorm
### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->
Improve performance
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Co-authored-by: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
