Merge branch 'mw-update-rainbow-usages-in-lib-tasks-gitlab-backup-rake' into 'master'

Add Rainbow in lib/tasks/gitlab/backup

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/160827



Merged-by: James Nutt <jnutt@gitlab.com>
Approved-by: James Nutt <jnutt@gitlab.com>
Co-authored-by: Martin Wortschack <mwortschack@gitlab.com>