Merge branch '442655-duo-chat-ga-alert' into 'master'

Notify Duo Chat beta users that Chat is in GA

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/149329



Merged-by: Doug Stull <dstull@gitlab.com>
Approved-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>
Approved-by: Jay Montal <jmontal@gitlab.com>
Approved-by: Doug Stull <dstull@gitlab.com>
Approved-by: Paulina Sedlak-Jakubowska <psedlak-jakubowska@gitlab.com>
Reviewed-by: Max Woolf <mwoolf@gitlab.com>
Co-authored-by: rliu-gl <rliu@gitlab.com>