[Test fix] improve AOT test

[jennyf19]

the test in Wilson was timing out sporadically. There is a better way - instead of it being an XUnit test, use a powershell script called from a GH action.

ex:

https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/build/test-aot-compatibility.ps1 https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/.github/workflows/verifyaotcompat.yml

this is the test: https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/blob/ea42b6b3d03c258a16f00601a6ee5994f2c61406/test/Microsoft.IdentityModel.AotCompatibility.Tests/AotCompatibilityTests.cs#L35