Merge branch 'gdk-open-gitpod' into 'main'

Make `gdk open` work on Gitpod

See merge request https://gitlab.com/gitlab-org/gitlab-development-kit/-/merge_requests/3438



Merged-by: Ash McKenzie <amckenzie@gitlab.com>
Approved-by: Ash McKenzie <amckenzie@gitlab.com>
Co-authored-by: Anatoli Babenia <anatoli@rainforce.org>