Arm64 build/test/publish.

[michaelgsharp]

This PR adds in Arm64 to the building/testing/publishing.

It adds a way to check for the native binaries for the tests. This allows us to skip tests if the native binary doesn't exist, but run them if they do (like OnnxRuntime on Arm64. Doesn't have a pre-compiled binary, but if the user compiles it and drops it in, it will run).

[codecov]

Codecov Report

Merging #5860 (591a183) into main (0fac0ba) will decrease coverage by 0.07%.
The diff coverage is 52.83%.

@@            Coverage Diff             @@
##             main    #5860      +/-   ##
==========================================
- Coverage   68.26%   68.19%   -0.08%     
==========================================
  Files        1134     1142       +8     
  Lines      241961   242367     +406     
  Branches    25302    25355      +53     
==========================================
+ Hits       165178   165282     +104     
- Misses      70145    70407     +262     
- Partials     6638     6678      +40     

Flag	Coverage Δ
Debug	68.19% <52.83%> (-0.08%)	⬇️
production	62.87% <ø> (-0.06%)	⬇️
test	88.56% <52.83%> (-0.27%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...est/Microsoft.ML.Predictor.Tests/TestPredictors.cs	70.11% <ø> (+0.49%)	⬆️
....TestFramework/Attributes/LightGBMFactAttribute.cs	83.33% <0.00%> (-16.67%)	⬇️
...estFramework/Attributes/LightGBMTheoryAttribute.cs	83.33% <0.00%> (-16.67%)	⬇️
...est/Microsoft.ML.TestFramework/BaseTestBaseline.cs	76.62% <0.00%> (+2.09%)	⬆️
test/Microsoft.ML.TestFramework/TestCommandBase.cs	39.41% <ø> (ø)
test/Microsoft.ML.Tests/DatabaseLoaderTests.cs	93.33% <ø> (ø)
...est/Microsoft.ML.Tests/FeatureContributionTests.cs	98.68% <ø> (ø)
.../Scenarios/Api/Estimators/SimpleTrainAndPredict.cs	94.73% <ø> (ø)
...rosoft.ML.Tests/TrainerEstimators/FAFMEstimator.cs	100.00% <ø> (ø)
...Microsoft.ML.Tests/TrainerEstimators/LbfgsTests.cs	97.45% <ø> (ø)
... and 55 more

[eerhardt]

This looks great @michaelgsharp. Nice work here!

I only had a handful of very minor comments.