fix: remove unused files

__tests__/sample-csproj/Program.cs

@@ -1,15 +0,0 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using System;
-
-namespace sample_csproj
-{
-    [TestClass]
-    public class Program
-    {
-        [TestMethod]
-        public void TestMethod1()
-        {
-            Console.WriteLine("Hello, World!");
-        }
-    }
-}

__tests__/sample-csproj/sample.csproj

@@ -1,18 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFrameworks>netcoreapp3.1;netcoreapp3.0;netcoreapp2.2</TargetFrameworks>
-    <RootNamespace>sample_csproj</RootNamespace>
-
-    <IsPackable>false</IsPackable>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <!-- These packages will be downloaded over the network for testing proxy settings -->
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.1.0" />
-    <PackageReference Include="coverlet.collector" Version="1.2.0" />
-  </ItemGroup>
-
-</Project>

__tests__/verify-dotnet.sh

@@ -1,44 +0,0 @@
-if [ -z "$1" ]; then
-  echo "Must supply dotnet version argument"
-  exit 1
-fi
-
-if [ ! -f "../nuget.config" ]; then
-  echo "nuget file not generated correctly"
-  exit 1
-fi
-
-dotnet_version="$(dotnet --version)"
-echo "Found dotnet version '$dotnet_version'"
-if [ -z "$(echo $dotnet_version | grep $1)" ]; then
-  echo "Unexpected version"
-  exit 1
-fi
-
-if [ -n "$2" ]; then
-  dotnet_version="$(dotnet --list-sdks)"
-  echo "Found dotnet version '$dotnet_version'"
-  if [ -z "$(echo $dotnet_version | grep $2)" ]; then
-    echo "Unexpected version"
-    exit 1
-  fi
-fi
-
-echo "Building sample csproj"
-dotnet build __tests__/sample-csproj/ --no-cache || exit 1
-
-echo "Testing compiled app"
-sample_output=$(dotnet test __tests__/sample-csproj/ --no-build)
-echo "Sample output: $sample_output"
-# For Side-by-Side installs we want to run the tests twice, for a single install the tests will run once
-if [ -n "$2" ]; then
-  if [ -z "$(echo $sample_output | grep "Test Run Successful.*Test Run Successful.")" ]; then
-    echo "Unexpected output"
-    exit 1
-  fi
-else
-  if [ -z "$(echo $sample_output | grep "Test Run Successful.")" ]; then
-    echo "Unexpected output"
-    exit 1
-  fi
-fi