Merge branch '451024-add-description-column-for-custom-roles' into 'master'

Add description column for custom roles

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147620



Merged-by: Jacques Erasmus <jerasmus@gitlab.com>
Approved-by: Ilonah Pelaez <ipelaez@gitlab.com>
Approved-by: Rudy Crespo <rcrespo@gitlab.com>
Approved-by: Jacques Erasmus <jerasmus@gitlab.com>
Reviewed-by: Rudy Crespo <rcrespo@gitlab.com>
Reviewed-by: Ilonah Pelaez <ipelaez@gitlab.com>
Co-authored-by: Daniel Tian <dtian@gitlab.com>