Add Microsoft.ML.OnnxRuntime nuget props for Linux and MacOS #8666

Job	Run time
4. Build Minimal (Globally Allowed Types)	8m 18s
6c. Build Extended Minimal (No Optional Features)	7m 45s
6a. Build Regular (No Optional Features)	12m 15s
6b. Build Minimal (No Optional Features)	7m 16s
2. Build Minimal (Exceptions Disabled)	10m 2s
1. Build Full ORT and Generate ORT Files	17m 11s
5. Build Extended Minimal	10m 29s
3a. Build Minimal (Custom Ops)	8m 18s
3b. Build Minimal (Type Reduction)	8m 20s
7. Build Extended Minimal (Android NNAPI)	9m 47s
	1h 39m 41s

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