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/Configuration/TestDataSettings.cs

@@ -0,0 +1,16 @@
+namespace Umbraco.TestData.Configuration
+{
+    public class TestDataSettings
+    {
+        /// <summary>
+        /// Gets or sets a value indicating whether the test data generation is enabled.
+        /// </summary>
+        public bool Enabled { get; set; } = false;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether persisted local database cache files for content and media are disabled.
+        /// </summary>
+        /// <value>The URL path.</value>
+        public bool IgnoreLocalDb { get; set; } = false;
+    }
+}