Merge branch 'kassio/extract-pages-url-methods-from-project' into 'master'

Move GitLab Pages URL logic to a single place

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124886



Merged-by: drew stachon <730684-drew@users.noreply.gitlab.com>
Approved-by: Ankit Panchal <apanchal@gitlab.com>
Approved-by: Jacques Erasmus <jerasmus@gitlab.com>
Approved-by: Andrejs Cunskis <acunskis@gitlab.com>
Approved-by: Tetiana Chupryna <tchupryna@gitlab.com>
Approved-by: drew stachon <730684-drew@users.noreply.gitlab.com>
Approved-by: David Dieulivol <ddieulivol@gitlab.com>
Reviewed-by: Kassio Borges <kborges@gitlab.com>
Reviewed-by: Vladimir Shushlin <vshushlin@gitlab.com>
Reviewed-by: Ankit Panchal <apanchal@gitlab.com>
Co-authored-by: Kassio Borges <kassioborgesm@gmail.com>