Don't exclude from migrations derived tables for TPT and TPC

Fixes #30079

Author: AndriySvyryd

src/EFCore.Relational/Extensions/RelationalEntityTypeExtensions.cs

@@ -1379,13 +1379,16 @@ public static bool IsTableExcludedFromMigrations(this IReadOnlyEntityType entity
             return excluded.Value;
         }
 
-        if (entityType.BaseType != null)
+        if (entityType.BaseType != null
+            && entityType.GetMappingStrategy() == RelationalAnnotationNames.TphMappingStrategy)
         {
             return entityType.GetRootType().IsTableExcludedFromMigrations();
         }
 
         var ownership = entityType.FindOwnership();
-        if (ownership is { IsUnique: true })
+        if (ownership is { IsUnique: true }
+            && ownership.DeclaringEntityType.GetTableName() == entityType.GetTableName()
+            && ownership.DeclaringEntityType.GetSchema() == entityType.GetSchema())
         {
             return ownership.PrincipalEntityType.IsTableExcludedFromMigrations();
         }

src/EFCore.Relational/Migrations/Internal/MigrationsModelDiffer.cs

@@ -558,7 +558,7 @@ protected virtual IEnumerable<MigrationOperation> Diff(
         DiffContext diffContext)
     {
         if (source.IsExcludedFromMigrations
-            && target.IsExcludedFromMigrations)
+            || target.IsExcludedFromMigrations)
         {
             // Populate column mapping
             foreach (var _ in Diff(source.Columns, target.Columns, diffContext))

test/EFCore.Cosmos.FunctionalTests/ConfigPatternsCosmosTest.cs

@@ -88,7 +88,7 @@ public async Task Should_throw_if_specified_region_is_wrong()
             exception.Message);
     }
 
-    [ConditionalFact(Skip = "Issue #runtime/issues/89118")]
+    [ConditionalFact]
     public async Task Should_not_throw_if_specified_connection_mode_is_right()
     {
         var connectionMode = ConnectionMode.Direct;

test/EFCore.Relational.Tests/Migrations/Internal/MigrationsModelDifferTest.cs

@@ -8284,6 +8284,62 @@ public void Change_TPT_to_TPC_with_FKs_and_seed_data()
                     Assert.Equal(ReferentialAction.Cascade, operation.OnDelete);
                 }));
 
+    [ConditionalFact]
+    public void Change_TPT_to_TPC_with_excluded_base()
+        => Execute(
+            common =>
+            {
+                common.Entity(
+                    "Order",
+                    x =>
+                    {
+                        x.ToTable("Order", t => t.ExcludeFromMigrations());
+                        x.Property<int>("Id");
+                        x.Property<string>("Address");
+                    });
+                common.Entity(
+                    "DetailedOrder",
+                    x =>
+                    {
+                        x.ToTable("DetailedOrder");
+                        x.HasBaseType("Order");
+                        x.Property<string>("Description").HasColumnName("Description");
+                    });
+            },
+            _ => { },
+            target =>
+            {
+                target.Entity("Order").UseTpcMappingStrategy();
+            },
+            upOperations =>
+            {
+                Assert.Equal(2, upOperations.Count);
+
+                var dropForeignKeyOperation = Assert.IsType<DropForeignKeyOperation>(upOperations[0]);
+                Assert.Null(dropForeignKeyOperation.Schema);
+                Assert.Equal("DetailedOrder", dropForeignKeyOperation.Table);
+                Assert.Equal("FK_DetailedOrder_Order_Id", dropForeignKeyOperation.Name);
+
+                var addColumnOperation = Assert.IsType<AddColumnOperation>(upOperations[1]);
+                Assert.Null(addColumnOperation.Schema);
+                Assert.Equal("DetailedOrder", addColumnOperation.Table);
+                Assert.Equal("Address", addColumnOperation.Name);
+            },
+            downOperations =>
+            {
+                Assert.Equal(2, downOperations.Count);
+
+                var dropColumnOperation = Assert.IsType<DropColumnOperation>(downOperations[0]);
+                Assert.Null(dropColumnOperation.Schema);
+                Assert.Equal("DetailedOrder", dropColumnOperation.Table);
+                Assert.Equal("Address", dropColumnOperation.Name);
+
+                var addForeignKeyOperation = Assert.IsType<AddForeignKeyOperation>(downOperations[1]);
+                Assert.Null(addForeignKeyOperation.Schema);
+                Assert.Equal("DetailedOrder", addForeignKeyOperation.Table);
+                Assert.Equal("FK_DetailedOrder_Order_Id", addForeignKeyOperation.Name);
+            });
+
     [ConditionalFact]
     public void Add_foreign_key_on_base_type()
         => Execute(