* remove reference to TestAssetsManager in dotnet-add-reference
* remove TestAssetsManager dependency from dotnet-build
* remove TAM ref from dotnet-list-reference
* remove TAM dependency from dotnet-msbuild
* remove TAM dependency from ProjectJsonMigration tests
* remove TAM dependency from dotnet.Tests
* remove TAM dependency from dotnet-new.Tests
* remove TAM from dotnet-pack.Tests
* remove TAM from dotnet-publish.Tests
* remove TAM from dotnet-restore.Tests
* remove TAM dependency from dotnet-remove-reference.Tests
* remove TAM dependency from dotnet-run.Tests
* remove TAM dependency from dotnet-test.Tests
* remove TAM dependency from Microsoft.DotNet.Cli.Utils.Tests
* remove TAM from TestBase
* remove TAM
* remove newly introduced dependency on TAM
* Remove argument separator from commands
Currently, the argument separator (`--`) is only supported on
`dotnet run`. This PR removes it from other commands to make the help and
usage of these command clearer.
* Adding dotnet run message test
* Responding to PR feedback