Run tests on Windows again

[BrennanConroy]

Windows tests stopped running after #41311. Also, the RunHelix script was broken at the same time.

[dougbu]

Ugh, I remember thinking about using a fallback but must have forgotten 🤦

[wtgodbe]

Now we've got a real failure in Templates.Test.MvcTemplateTest.MvcTemplate_SingleFileExe

Project new mvc  failed to publish. Exit code -1.
dotnet publish  -c Release /bl /p:PublishSingleFile=true -r win-x64
StdErr:
StdOut: Microsoft (R) Build Engine version 17.3.0-preview-22254-01+e049bfe3d for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

C:hwA804099Apdotnet-clisdk7.0.100-preview.5.22258.1MSBuild.dll -maxcpucount -property:PublishSingleFile=true -property:RuntimeIdentifier=win-x64 -property:_CommandLineDefinedRuntimeIdentifier=true -property:Configuration=Release -restore -target:Publish -verbosity:m /bl .AspNet.rsujqrthdeb.csproj
Determining projects to restore...
Restored C:hwA804099AwA31A093CeTemplatesBaseFolderAspNet.rsujqrthdebAspNet.rsujqrthdeb.csproj (in 6.95 sec).
C:hwA804099Apdotnet-clisdk7.0.100-preview.5.22258.1SdksMicrosoft.NET.Sdk	argetsMicrosoft.NET.RuntimeIdentifierInference.targets(216,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [C:hwA804099AwA31A093CeTemplatesBaseFolderAspNet.rsujqrthdebAspNet.rsujqrthdeb.csproj]
C:hwA804099Apdotnet-clisdk7.0.100-preview.5.22258.1SdksMicrosoft.NET.Sdk	argetsMicrosoft.NET.Sdk.targets(1117,5): warning NETSDK1179: One of '--self-contained' or '--no-self-contained' options are required when '--runtime' is used. [C:hwA804099AwA31A093CeTemplatesBaseFolderAspNet.rsujqrthdebAspNet.rsujqrthdeb.csproj]
AspNet.rsujqrthdeb -> C:hwA804099AwA31A093CeTemplatesBaseFolderAspNet.rsujqrthdeb�inRelease
et7.0win-x64AspNet.rsujqrthdeb.dll
AspNet.rsujqrthdeb -> C:hwA804099AwA31A093CeTemplatesBaseFolderAspNet.rsujqrthdeb�inRelease
et7.0win-x64publish

Expected: True
Actual:   False

at Templates.Test.MvcTemplateTest.MvcTemplate_SingleFileExe() in /_/src/ProjectTemplates/test/MvcTemplateTest.cs:line 252

Quarantine? Or update the test to resolve warning NETSDK1179: One of '--self-contained' or '--no-self-contained' options are required when '--runtime' is used. CC @captainsafia @DamianEdwards

[captainsafia]

update the test to resolve warning NETSDK1179: One of '--self-contained' or '--no-self-contained' options are required when '--runtime' is used.

I believe we need to update the test to resolve the warning. That's what @DamianEdwards attempted in #41563.