Merge branch 'mw-update-rainbow-usages-in-db-fixtures-application-settions' into 'master'

Add Rainbow in db/fixtures/development/02_application_settings

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159793



Merged-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Co-authored-by: Martin Wortschack <mwortschack@gitlab.com>