Merge branch '503118-migrate-gl-text-green-500-gl-text-success' into 'master'

Migrate gl-text-green-500 -> gl-text-success

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/174422



Merged-by: Allison Browne <abrowne@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Approved-by: Scott de Jonge <sdejonge@gitlab.com>
Approved-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Approved-by: Allison Browne <abrowne@gitlab.com>
Reviewed-by: Scott de Jonge <sdejonge@gitlab.com>
Co-authored-by: James Rushford <jrushford@gitlab.com>