Merge branch '424966-frontend-add-the-readme-tab-with-the-current-content' into 'master'

Add the Catalog ReadMe tab

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/132408



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Reviewed-by: Frédéric Caplette <fcaplette@gitlab.com>
Reviewed-by: Thomas Hutterer <thutterer@gitlab.com>
Co-authored-by: Frédéric Caplette <fcaplette@gitlab.com>