Merge branch '463075-replace-legacy-css-for-duo-pro-access-denied' into 'master'

Replace legacy css for Duo Pro access denied page

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154798



Merged-by: Vitaly Slobodin <vslobodin@gitlab.com>
Approved-by: Jay Montal <jmontal@gitlab.com>
Approved-by: Vitaly Slobodin <vslobodin@gitlab.com>
Co-authored-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>