Remove redundant testing package references

Author: matt-edmondson

AppDataStorage.Test/AppDataStorage.Test.csproj

@@ -12,9 +12,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" />
-    <PackageReference Include="MSTest.TestAdapter" />
-    <PackageReference Include="MSTest.TestFramework" />
     <ProjectReference Include="..\AppDataStorage\AppDataStorage.csproj" />
     <PackageReference Include="TestableIO.System.IO.Abstractions.TestingHelpers" />
   </ItemGroup>