Enable generic feature level devices in DML EP (#20114)
### Description
Enable NPUs supporting DXCORE_ADAPTER_ATTRIBUTE_D3D12_GENERIC_ML and
D3D_FEATURE_LEVEL_1_0_GENERIC with DML EP. This also begins ingesting DX
headers through the DirectX-Headers repo.
Note that this includes an update to cgamanifest.json for onnx-tensorrt
which is triggered during re-generation due to a prior changes to
deps.txt.
### 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. -->
