Prevent External Users Registration

[MikeAlhayek]

Summary

Fix #17048
Fix #17059
Fix #16905

This PR also refines the registration and login processes to enable event-based hooks, allowing for easier customization and decoupling of code based on the enabled features. It also improves feature dependencies so code like the following is no longer needed:

var registrationFeatureIsAvailable = (await _shellFeaturesManager.GetAvailableFeaturesAsync())
                       .Any(feature => feature.Id == UserConstants.Features.UserRegistration);

// do something...

Release Notes

The user registration and login functionalities have been refactored for better extensibility:

• Registration Improvements:

  • The IRegistrationFormEvents interface now includes Task RegisteringAsync(UserRegisteringContext context) for streamlined customization.
  • A new base class, RegistrationFormEventsBase, allows developers to override only necessary methods.

• Login Improvements:

  • The ILoginFormEvent interface has a new method: Task<IActionResult> ValidatingLoginAsync(IUser user).
  • The LoginFormEventBase class enables overriding relevant methods. Note that the base implementation of LoggingInAsync() has been removed; you must now implement this method if using LoginFormEventBase.

• User Service Update:

  • A new method in IUserService interface: Task<IUser> RegisterAsync(RegisterUserForm model, Action<string, string> reportError) facilitates registration with error reporting.

These enhancements make the user management system more modular and customizable.

[github-actions]

This pull request has merge conflicts. Please resolve those before requesting a review.

[github-actions]

This pull request has merge conflicts. Please resolve those before requesting a review.

[Piedone]

Please don't resolve the convos, because it gets really hard for me to follow them for a second review.