Add explicit API test step in the pipeline

Author: vbreuss

tests/TestableIO.System.IO.Abstractions.Api.Tests/TestableIO.System.IO.Abstractions.Api.Tests.csproj

@@ -10,11 +10,6 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="GitHubActionsTestLogger" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" />
-		<PackageReference Include="NUnit"/>
-		<PackageReference Include="NUnit.Analyzers"/>
-		<PackageReference Include="NUnit3TestAdapter"/>
 		<PackageReference Include="PublicApiGenerator"/>
 		<PackageReference Include="aweXpect"/>
 	</ItemGroup>