[MIGraphX EP]Add support for skipLayerNormalization (#123) (microsoft#24886)

### Description
<!-- Describe your changes. -->
Add MIGraphX EP support for skipLayerNormalization via the supported OP
list in the execution provider


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Turns on skipLayerNormalization instead of filtering this out as one of
the supported ops by MIGraphX

Co-authored-by: Ted Themistokleous <[email protected]>

Author: TedThemistokleous

onnxruntime/core/providers/migraphx/migraphx_execution_provider.cc

@@ -1023,6 +1023,7 @@ GetUnsupportedNodeIndices(const GraphViewer& graph_viewer,
                                                     "SimplifiedLayerNormalization",
                                                     "Sin",
                                                     "Sinh",
+                                                    "SkipLayerNormalization",
                                                     "SkipSimplifiedLayerNormalization",
                                                     "Slice",
                                                     "Softmax",