Merged PR 6486412: Register ORT DML ONNX operators for int64
Now that DML has int64 support directly, register the related operators for uint64/int64 (rather than the hack in the ORT DML EP with doubled strides).
## Remaining work
- Not implemented in DML: CumSum, Range, MaxPool/MaxUnpool, TopK, ReduceProd/Sum/SumSquare/L1
- Implemented in DML but need DML EP kernel work: Clip, Pad, Neg, Range, ConstantOfShape
```
te.exe OnnxConformanceTests.dll
Summary: Total=4454, Passed=4147, Failed=0, Blocked=0, Not Run=0, Skipped=307
```
Corresponding PR: https://microsoft.visualstudio.com/WindowsAI/_git/WindowsAI/pullrequest/6486426
Related work items: #28761231, #33883294