Add note to hiring page
Related: https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/4956
\cc @gl-peopleops seeking your feedback on this.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Related: https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/4956
\cc @gl-peopleops seeking your feedback on this.