Add-Migration generates nullable columns for non-nullable properties inside owned types

[RafaelSalguero]

Migration tool Add-Migration generates code for adding a nullable column for non-nullable properties inside owned types

Steps to reproduce

1.- C# 8 nullable checks are on
2.- Add a non-nullable property to an Owned type
3.- Run Add-Migration
4.- nullable: true code is generated

class MyEntity {
  [Key]
  public int Id { get; set; }

  //This property is correctly generated (non nullable)
  public bool MyProp { get; set; }

  public MyOwnedType OwnedType { get; set; } = new MyOwnedType();
}

[Owned]
class MyOwnedType {
  //This property is generated as a nullable column (wrong)
  public bool OwnedProp { get; set; }
}

Generated code:

 
          migrationBuilder.AddColumn<bool>(
                name: "MyProp",
                table: "MyEntity",
                nullable: false,
                defaultValue: false);

            migrationBuilder.AddColumn<bool>(
                name: "OwnedType_OwnedProp",
                table: "MyEntity",
                nullable: true);

Further technical details

EF Core version: 3.0.0
Database provider: Microsoft.EntityFrameworkCore.SqlServer 3.0.0
Target framework: netcoreapp3
Operating system: Windows 10
Visual Studio 2019 16.3.7

[ajcvickers]

Duplicate of #16943