Merge branch 'integration/phorge' into 'master'

Support Phorge as an external issue tracker

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/145863



Merged-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Martin Čavoj <mcavoj@gitlab.com>
Approved-by: Jonas Larsen <jlarsen@gitlab.com>
Approved-by: Magdalena Frankiewicz <mfrankiewicz@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Diana Logan <dlogan@gitlab.com>
Reviewed-by: Nicolas Dular <ndular@gitlab.com>
Reviewed-by: Daniel Duvall <dan@mutual.io>
Reviewed-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Reviewed-by: Martin Čavoj <mcavoj@gitlab.com>
Co-authored-by: Brennen Bearnes <code@p1k3.com>
Co-authored-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Brennen Bearnes <gitlab@chaff.p1k3.com>
Co-authored-by: Evan Read <eread@gitlab.com>
Co-authored-by: Nicolas Dular <ndular@gitlab.com>
Co-authored-by: Dan Duvall <dduvall@wikimedia.org>
Co-authored-by: Martin Čavoj <mcavoj@gitlab.com>