Move test projects from src/ to tests/ (#11357)

* Update gitignore

* Move csproj

* Update project references

* Update solutions

* Update build scripts

* Tests used to share editorconfig with projects in src

* Fix broken tests.

* Stop copying around .editorconfig

merged root one with linting

* csharp_style_expression_bodied -> suggestion

* Move StyleCop rulesets to matching directories and update shared build properties

* Remove legacy build files, update NuGet.cofig and solution files

* Restore myget source

* Clean up .gitignore

* Update .gitignore

* Move new test classes to tests after merge

* Gitignore + nuget config

* Move new test

Co-authored-by: Ronald Barendse <ronald@barend.se>

tests/Umbraco.TestData/Umbraco.TestData.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>Umbraco.TestData</RootNamespace>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Bogus" Version="33.1.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Umbraco.Core\Umbraco.Core.csproj" />
+    <ProjectReference Include="..\..\src\Umbraco.PublishedCache.NuCache\Umbraco.PublishedCache.NuCache.csproj" />
+    <ProjectReference Include="..\..\src\Umbraco.Web.Common\Umbraco.Web.Common.csproj" />
+    <ProjectReference Include="..\..\src\Umbraco.Web.Website\Umbraco.Web.Website.csproj" />
+  </ItemGroup>
+
+</Project>