Relocates the endpoint for updating user admin status from the dedicated AdminController to the UserProfileController.
This consolidates user profile management under a single controller
and leverages existing authorization policies.
Adds an authorization policy to restrict access to admin-only endpoints.
Creates an `AdminOnlyRequirement` and `AdminOnlyHandler` to check if a user has admin privileges.
Applies the "AdminOnly" policy to the AdminController to secure admin functionalities.
Modifies the endpoint for changing user admin status to include the user ID in the route.
Moves the ChangeUserAdminStatusRequest to the ApiModels folder.
Updates the admin controller route to "admin" and the admin status
endpoint to "adminStatus".
Makes the ChangeUserAdminStatus method asynchronous.
Uses NotFoundException instead of KeyNotFoundException.
Adds functionality to allow administrators to modify the admin status of other users.
Introduces an endpoint for changing user admin status, accessible only to existing administrators.
This change includes necessary services and request models to handle the logic.
