[REF] gamification, website_forum: move karma, badge and badge level to gamification

Purpose of this commit is to prepare addition of gamification in slides /
eLearning platform. In order to be able to use karma and the badges in other
modules we move those models in gamification.

Partial commit linked to eLearning project. Main specifications related
to gamification and user profile can be found on task 1922159 (PR #30514).
Main specifications related to eLearning can be found on task 1902304
(PR #29876).