Update Pages permissions checks

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/172950



Merged-by: Kassio Borges <kborges@gitlab.com>
Approved-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Approved-by: Janis Altherr <jaltherr@gitlab.com>
Approved-by: Kassio Borges <kborges@gitlab.com>
Reviewed-by: Kassio Borges <kborges@gitlab.com>
Reviewed-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Co-authored-by: Ben King <bking@gitlab.com>