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Add [NotNull] attribute on the Should() method of reference types

Compelling example:

```csharp
[Theory]
[InlineData(true)]
[InlineData(false)]
public void Test1(bool currentUser)
{
    IPrincipal principal = currentUser ? new WindowsPrincipal(WindowsIdentity.GetCurrent()) : new ClaimsPrincipal();
    IIdentity? identity = principal.Identity;
    
    identity.Should().NotBeOfType<GenericIdentity>();
    identity.IsAuthenticated.Should().BeFalse();
}
```

Fixes #1115

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