Merge branch '519217-move-feature-settings-directory-to-duo-self-hosted-root' into 'master'

Relocate /feature_settings folder to the root /duo_self_hosted directory

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182050



Merged-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Approved-by: Marina Mosti <mmosti@gitlab.com>
Approved-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Reviewed-by: Marina Mosti <mmosti@gitlab.com>
Co-authored-by: Julie Huang <julhuang@gitlab.com>