Test: Use AssertQuery in NorthwindIncludeQueryTestBase

- Remove string based includes from base class. (will move to a different class)
- Remove tests related to no tracking from base class. (will move to a different class)
- Run tests for both sync/async

test/EFCore.InMemory.FunctionalTests/Query/NorthwindIncludeQueryInMemoryTest.cs

@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Threading.Tasks;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -15,9 +16,9 @@ public NorthwindIncludeQueryInMemoryTest(IncludeInMemoryFixture fixture, ITestOu
         }
 
         [ConditionalTheory(Skip = "Issue#17386")]
-        public override void Include_collection_with_last_no_orderby(bool useString)
+        public override Task Include_collection_with_last_no_orderby(bool async)
         {
-            base.Include_collection_with_last_no_orderby(useString);
+            return base.Include_collection_with_last_no_orderby(async);
         }
     }
 }