Merge branch '415482-ignore-columns' into 'master'

Remove use and ignore dashboard_notification_limit

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/127016



Merged-by: Allen Cook <acook@gitlab.com>
Approved-by: Allen Cook <acook@gitlab.com>
Approved-by: Jay Montal <jmontal@gitlab.com>
Co-authored-by: Doug Stull <dstull@gitlab.com>