[FEATURE] Finish users ban (cron)

[andreaflether]

Please describe the problem to be solved

Currently, when a user is banned, the ban is not automatically over, because there is no logic applied to the ends_at field.

(Optional): Suggest a solution

• Add cron job that runs every day at 23:59 to set banned = false in User model.
• Additionally, set ban date to end of day {CURRENT_DATE} + 7.days.end_of_day, instead of {CURRENT_DATE} + 7.days.