Migrate model tests to ONNX Model ZOO only (#25888)
### Description
- Added `VERIFIED_PUBLIC_MODELS` (20 unique models) and
`ONNX_ZOO_MODELS` (158 total)
- Implemented `IsModelAllowed()` function with O(1) hash lookup
- Added comprehensive name mapping for backwards compatibility
- Maintained all existing EP provider configurations
### Motivation and Context
- Part of ONNX Runtime Phase 1 migration initiative
- Addresses security requirements for public CI pipelines
- Prepares for ORT 1.23.0 release compliance
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Co-authored-by: Emmanuel Assumang <eassumang@microsoft.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
