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Issue Title:

Allow New Users to Join Multiple Groups Upon Registration from the Frontend

Description:

Currently, Joomla allows administrators to assign new users to multiple groups from the backend. However, this functionality is not available on the frontend during the user registration process. I propose an enhancement to enable the selection of multiple user groups at the time of registration from the frontend.

Steps to Reproduce:

1. A new user registers on the site through the frontend.
2. During registration, the user is automatically assigned to one default group.

Expected Result:

The New_User_Registration_Group field should allow for the selection of multiple groups. As a result, when a new user registers from the frontend, they should be able to be associated with multiple predefined groups simultaneously.

Actual Result:

Currently, the user is only able to be assigned to one group during the frontend registration process.

System Information:

Additional Comments:

This enhancement would streamline the process for users who need to be part of multiple groups, reducing the need for administrator intervention post-registration.

There are extensions available for this

If you have multiple groups in your system then this is for a reason. You want to give users different rights or they should have access to different parts of the system. This isn't something you can fully automate, it needs user interaction.

I might oversee something here so I am not closing this but convert it to a discussion to find out what the goal for it is or understand better the requierements/use case.