ValidatableType silent ignore validation for most use cases

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

* Silent ignore validation on visibility issues
* Silent ignore validation on `IValidatableObject` on interfaces
* Silent ignore validation on Validation Attributes on interface properties
* Silent ignore validation on types used via Interfaces with no Validation Attributes properties
* Mess with ValidatableType in .Embedded and adding `[SkipValidation]` which adds a `using` that then causes a name conflict for ValidatableType.

### Expected Behavior

Validation is done, or compile error

### Steps To Reproduce

```csharp
using System.ComponentModel.DataAnnotations;

namespace BlazorApp22.Components.Pages;

/*
//uncomment for compile error
using Microsoft.Extensions.Validation;

[ValidatableType]
public class CompileError
{
[SkipValidation] public TheChild Child { get; } = new();

public class TheChild
{
[Required]
public string? Name { get; set; }
}
}
*/

public partial class Home
{
private PrivateModel PrivateVisibility { get; } = new();
private InternalModel InternalVisibility { get; } = new();
private PublicModel PublicVisibility { get; } = new();
private PublicWithInternalChildModel PublicWithInternalChild { get; } = new();
private PublicWithInternalChildPropModel PublicWithInternalChildProp { get; } = new();
private ChildWithIValidatableObject ChildWithIValidatableObject { get; } = new();
private ChildWithAttribute ChildWithAttribute { get; } = new();
private ChildWithDoubleValidatableType ChildWithDoubleValidatableType { get; } = new();
private ChildWithClassWithAttribute ChildWithClassWithAttribute { get; } = new();
private ChildWithClassWithTrippleAttribute ChildWithClassWithTrippleAttribute { get; } = new();
private ChildWithClassWithAdditionalProp ChildWithClassWithAdditionalProp { get; } = new();

///
/// No validation done!
///
[ValidatableType]
private class PrivateModel
{
public TheChild Child { get; } = new();

public class TheChild
{
[Required] public string? Name { get; set; }
}
}

private void ValidSubmit()
{
Console.WriteLine("Failed");
}
}

///
/// No validation done!
///
[ValidatableType]
internal class InternalModel
{
public TheChild Child { get; } = new();

public class TheChild
{
[Required] public string? Name { get; set; }
}
}

///
/// Required error => Works
///
[ValidatableType]
public class PublicModel
{
public TheChild Child { get; } = new();

public class TheChild
{
[Required] public string? Name { get; set; }
}
}

///
/// No validation done!
///
[ValidatableType]
public class PublicWithInternalChildModel
{
internal TheChild Child { get; } = new();

public class TheChild
{
[Required] public string? Name { get; set; }
}
}
///
/// No validation done!
///
[ValidatableType]
public class PublicWithInternalChildPropModel
{
public TheChild Child { get; } = new();

public class TheChild
{
[Required] internal string? Name { get; set; }
}
}
///
/// No validation done!
///
[ValidatableType]
public class ChildWithIValidatableObject
{
public IChild Child { get; } = new TheChild();

public interface IChild : IValidatableObject
{
public string? Name { get; set; }
}

public class TheChild : IChild
{
public string? Name { get; set; }

public IEnumerable Validate(ValidationContext validationContext) => [new("Custom", [nameof(Name)])];
}
}

///
/// No validation done!
///
[ValidatableType]
public class ChildWithAttribute
{
public IChild Child { get; } = new TheChild();

public interface IChild
{
[Required] public string? Name { get; set; }
}

public class TheChild : IChild
{
public string? Name { get; set; }
}
}

///
/// No validation done!
///
[ValidatableType]
public class ChildWithDoubleValidatableType
{
public IChild Child { get; } = new TheChild();

public interface IChild
{
[Required] public string? Name { get; set; }
}

[ValidatableType]
public class TheChild : IChild
{
public string? Name { get; set; }
}
}

///
/// No validation done!
///
[ValidatableType]
public class ChildWithClassWithAttribute
{
public IChild Child { get; } = new TheChild();
public interface IChild
{
public string? Name { get; set; }
}

[ValidatableType]
public class TheChild : IChild, IValidatableObject
{
[Required] public string? Name { get; set; }
[Required] public string? Name2 { get; set; }

public IEnumerable Validate(ValidationContext validationContext) => [new("Custom", [nameof(Name)])];
}

}

///
/// Required error => Works
///
[ValidatableType]
public class ChildWithClassWithTrippleAttribute
{
public IChild Child { get; } = new TheChild();
public interface IChild
{
[Required] public string? Name { get; set; }
}

[ValidatableType]
public class TheChild : IChild
{
[Required] public string? Name { get; set; }
}

}

///
/// Required error => Works
///
[ValidatableType]
public class ChildWithClassWithAdditionalProp
{
public IChild Child { get; } = new TheChild();
public interface IChild
{
[Required] public bool Dummy { get; }
public string? Name { get; set; }
}

[ValidatableType]
public class TheChild : IChild
{
public bool Dummy => true;
[Required] public string? Name { get; set; }
}

}
```

```razor
@page "/"
@rendermode InteractiveServer
Home

Leave the value empty and press submit! They should all give a required error!!

PrivateVisibility



Submit

InternalVisibility



Submit

PublicVisibility



Submit

PublicWithInternalChild



Submit

PublicWithInternalChildProp



Submit

ChildWithIValidatableObject



Submit

ChildWithAttribute



Submit

ChildWithDoubleValidatableType



Submit

ChildWithClassWithAttribute



Submit

ChildWithClassWithTrippleAttribute



Submit

ChildWithClassWithAdditionalProp



Submit

```

and ofcrouse `builder.Services.AddValidation();` in program.cs

### Exceptions (if any)

_No response_

### .NET Version

10.0.100

### Anything else?

Visual Studio 2026 Developer PowerShell v18.3.0-insiders