Add experimental namespace_in_path pages url in deploy & Job artifacts

See merge request !137615



Merged-by: Furkan Ayhan <furkanayhn@gmail.com>
Approved-by: Simon Knox <simon@gitlab.com>
Approved-by: Sincheol (David) Kim <dkim@gitlab.com>
Approved-by: Furkan Ayhan <furkanayhn@gmail.com>
Approved-by: Michał Zając <mzajac@gitlab.com>
Approved-by: Minahil Nichols <minahilnichols@gitlab.com>
Reviewed-by: Simon Knox <simon@gitlab.com>
Co-authored-by: ngala <ngala@gitlab.com>