Rename CheckPropertyBelongsToType to CheckContains

Per #32813 (review)

Author: ajcvickers

src/EFCore/ChangeTracking/Internal/ArrayPropertyValues.cs

@@ -132,8 +132,8 @@ public override object? this[string propertyName]
     /// </summary>
     public override object? this[IProperty property]
     {
-        get => _values[EntityType.CheckPropertyBelongsToType(property).GetIndex()];
-        set => SetValue(EntityType.CheckPropertyBelongsToType(property).GetIndex(), value);
+        get => _values[EntityType.CheckContains(property).GetIndex()];
+        set => SetValue(EntityType.CheckContains(property).GetIndex(), value);
     }
 
     /// <summary>

src/EFCore/ChangeTracking/Internal/CurrentPropertyValues.cs

@@ -40,7 +40,7 @@ public override TValue GetValue<TValue>(string propertyName)
     ///     doing so can result in application failures when updating to a new Entity Framework Core release.
     /// </summary>
     public override TValue GetValue<TValue>(IProperty property)
-        => InternalEntry.GetCurrentValue<TValue>(InternalEntry.EntityType.CheckPropertyBelongsToType(property));
+        => InternalEntry.GetCurrentValue<TValue>(InternalEntry.EntityType.CheckContains(property));
 
     /// <summary>
     ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to

src/EFCore/ChangeTracking/Internal/EntryPropertyValues.cs

@@ -130,8 +130,8 @@ public override object? this[string propertyName]
     /// </summary>
     public override object? this[IProperty property]
     {
-        get => GetValueInternal(EntityType.CheckPropertyBelongsToType(property));
-        set => SetValueInternal(EntityType.CheckPropertyBelongsToType(property), value);
+        get => GetValueInternal(EntityType.CheckContains(property));
+        set => SetValueInternal(EntityType.CheckContains(property), value);
     }
 
     /// <summary>

src/EFCore/ChangeTracking/Internal/OriginalPropertyValues.cs

@@ -40,7 +40,7 @@ public override TValue GetValue<TValue>(string propertyName)
     ///     doing so can result in application failures when updating to a new Entity Framework Core release.
     /// </summary>
     public override TValue GetValue<TValue>(IProperty property)
-        => InternalEntry.GetOriginalValue<TValue>(InternalEntry.EntityType.CheckPropertyBelongsToType(property));
+        => InternalEntry.GetOriginalValue<TValue>(InternalEntry.EntityType.CheckContains(property));
 
     /// <summary>
     ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to

src/EFCore/Metadata/Internal/EntityTypeExtensions.cs

@@ -303,7 +303,7 @@ public static IEnumerable<IReadOnlyNavigation> FindDerivedNavigations(
     ///     any release. You should only use it directly in your code with extreme caution and knowing that
     ///     doing so can result in application failures when updating to a new Entity Framework Core release.
     /// </summary>
-    public static IProperty CheckPropertyBelongsToType(
+    public static IProperty CheckContains(
         this IEntityType entityType,
         IProperty property)
     {