AbstractAcceptanceTest integrationtest fix for vs2019

the new vs2019 (16.2.0) test explorer has an issue with GetAssemblies when it tries to load internal test assemblies
microsoft/vstest#2008

with this fix the Microsoft assemblies are not loaded when an integration test runs (FunctionMonkey.Testing.AbstractAcceptanceTest)

Source/FunctionMonkey/ConfigurationLocator.cs

@@ -40,7 +40,7 @@ public static IFunctionAppConfiguration FindConfiguration()
 
         private static bool Scan(out MethodInfo linkBackInfo, out IFunctionAppConfiguration findConfiguration)
         {
-            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
+            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies().Where(a => !a.GetName().Name.StartsWith("Microsoft.")).ToArray();
             linkBackInfo = null;
             findConfiguration = null;