Add support for enabling requirepass in Sentinel configuration

See merge request https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/6923



Merged-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Approved-by: Dustin Collins <714871-dustinmm80@users.noreply.gitlab.com>
Approved-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Co-authored-by: Stan Hu <stanhu@gmail.com>