Add ASP.NET Core runtime version test

[jonfortescue]

Closes #7022.

Adds a test to verify that the hardcoded version of the ASP.NET Core runtime matches the .NET SDK version.

Example console logs (from UnitTests.proj): Passing
Example console logs (from testing proj): Passing, Failing due to mismatch, Failing due to invalid version number

To double check:

• The right tests are in and and the right validation has happened. Guidance: https://github.com/dotnet/core-eng/tree/master/Documentation/Validation

[jonfortescue]

Forgot to make it only run on Windows lol. One sec.

[MattGal]

LGTM, was going to make the windows comment but you beat me to it.

[premun]

Looks good!

I can see one possible way this could fail - if someone went and changed the the type of .NET in the unit tests from SDK to ASP.NET Runtime. Then we would be testing ASPNET vs ASPNET and it would always succeed. But I guess other parts of the unit tests would fail and this won't really happen.

[premun]

Can you also please use this property inside XHarnessRunner.targets?

[jonfortescue]

@premun Check out the latest push and see if you think this will work.

[premun]

@jonfortescue it didn't work out of the box? without pulling the property in its own file?

I think the whole DotNetCli is included for Helix SDK already

[premun]

I am meaning to say - did you just try using the property without any other changes?

[premun]

@jonfortescue seems like Microsoft.DotNet.Helix.Sdk.targets includes all props on line 5:

  <Import Project="$(MSBuildThisFileDirectory)*/*.props"/>

If you went few commits back and didn't pull the property in its own new file, and just define it in DotNetCli.props, things should work still and the property should be visible.

I might be wrong but can you verify that please?

[jonfortescue]

@premun oooh neat. let's test it.

[premun]

Nice, should work well!

Also we should probably move to .NET 6.0 preview 3 in Arcade