onnxruntime

[VitisAI] Add processing for sessionOptions.AppendExecutionProvider("VitisAI", options) (#21839)

### Description
<!-- Describe your changes. -->

[VitisAI] Add processing for
sessionOptions.AppendExecutionProvider("VitisAI", options)

### 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. -->

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Co-authored-by: Zhenze Wang <zhenzew@xilinx.com>