Query: Add TPT variation for ManyToMany tests

This also cover some split queries

Part of #21510

test/EFCore.Relational.Specification.Tests/Query/TPTManyToManyNoTrackingQueryRelationalTestBase.cs

@@ -0,0 +1,14 @@
+// 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.
+
+namespace Microsoft.EntityFrameworkCore.Query
+{
+    public abstract class TPTManyToManyNoTrackingQueryRelationalTestBase<TFixture> : ManyToManyNoTrackingQueryRelationalTestBase<TFixture>
+        where TFixture : TPTManyToManyQueryRelationalFixture, new()
+    {
+        protected TPTManyToManyNoTrackingQueryRelationalTestBase(TFixture fixture)
+            : base(fixture)
+        {
+        }
+    }
+}

test/EFCore.Relational.Specification.Tests/Query/TPTManyToManyQueryRelationalFixture.cs

@@ -0,0 +1,21 @@
+// 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 Microsoft.EntityFrameworkCore.TestModels.ManyToManyModel;
+
+namespace Microsoft.EntityFrameworkCore.Query
+{
+    public abstract class TPTManyToManyQueryRelationalFixture : ManyToManyQueryRelationalFixture
+    {
+        protected override string StoreName { get; } = "TPTManyToManyQueryTest";
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder, DbContext context)
+        {
+            base.OnModelCreating(modelBuilder, context);
+
+            modelBuilder.Entity<EntityRoot>().ToTable("Roots");
+            modelBuilder.Entity<EntityBranch>().ToTable("Branches");
+            modelBuilder.Entity<EntityLeaf>().ToTable("Leaves");
+        }
+    }
+}

test/EFCore.Relational.Specification.Tests/Query/TPTManyToManyQueryRelationalTestBase.cs

@@ -0,0 +1,14 @@
+// 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.
+
+namespace Microsoft.EntityFrameworkCore.Query
+{
+    public abstract class TPTManyToManyQueryRelationalTestBase<TFixture> : ManyToManyQueryRelationalTestBase<TFixture>
+        where TFixture : TPTManyToManyQueryRelationalFixture, new()
+    {
+        protected TPTManyToManyQueryRelationalTestBase(TFixture fixture)
+            : base(fixture)
+        {
+        }
+    }
+}