LocalDb TestDatabase cleanup

LocalDbTestDatabase now renames the final database like it used to (guid vs sensible name)
Made serilog log to integration tests TEMP as far as I can tell it wasn't writing at all before

src/Umbraco.Tests.Integration/Testing/BaseTestDatabase.cs

@@ -17,8 +17,8 @@ namespace Umbraco.Tests.Integration.Testing
     {
         protected ILoggerFactory _loggerFactory;
         protected IUmbracoDatabaseFactory _databaseFactory;
-        protected IEnumerable<TestDbMeta> _testDatabases;
-        
+        protected IList<TestDbMeta> _testDatabases;
+
         protected UmbracoDatabase.CommandInfo[] _cachedDatabaseInitCommands;
 
         protected BlockingCollection<TestDbMeta> _prepareQueue;